Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1b77d52c3a32c1…

MALICIOUS

PDF

91.4 KB Created: 2021-04-18 08:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f57a3cba8484f0642d256684ec97e59d SHA-1: 2ee74f58b2d10fb5ed7c424070156844390a7b10 SHA-256: cb1b77d52c3a32c1c2eed07568910748d8d2d1113222d8ed5b3f75d584fb5f36
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of links, many on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/strik?utm_term=aci+318-14+design+examples+metric PDF link annotation
    • http://snail-case.store/2063608979269roh.pdfIn PDF document text
    • https://cdn.sqhk.co/wadalibituge/d9jhghr/39814518559.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/S1zFAXD/srs_topup_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fedukifenufu/eXhe6G0/concept_art_portfolio_template.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/giSUggI/8527965774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5fe5cfa291155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481510/normal_603d1929962b3.pdfIn PDF document text
    • https://cdn.sqhk.co/libewepigux/b1PG73D/motu_patlu_car_game_2_mod_apk.pdfIn PDF document text
    • http://zespodsvetkoy.site/satuwijudafiluwevopoxomawtebz6.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/XwheKjf/kisisumozisokidotanev.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/XY0ieF1/fifa_world_cup_qualifiers_2018_asia.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/h6jJIxj/wevuzeko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_60327b3520a65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_5fd2e141099d2.pdfIn PDF document text
    • https://cdn.sqhk.co/vorinugobol/joTYges/police_car_drift_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/gjYigjh/46031533702.pdfIn PDF document text
    • http://kamini33.ru/matlab_program_for_short_circuit_analysis05pj4.pdfIn PDF document text
    • http://epaytds.xyz/canon_pixma_mg3122_printer_manual0q8ti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_6035f742d9315.pdfIn PDF document text
    • http://prizinsta24.space/math_order_operations_rules_brackets5425a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_6c9a986303f845d7b3f50a0e832fbb45.pdf?index=trueIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_73470b3478a94822b0ec87f3554cab97.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_6ede1be588604e4e85814421c1199c3d.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_7f0138c0b3744db493114afd78713d81.pdf?index=trueIn PDF document text
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_26e40c503cf1439396d0b00d773c5c01.pdf?index=trueIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_484d5388ea0d4ac3985f1d8b392ef26f.pdf?index=trueIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_d7e6c2fb961745d3a91f024d72d8afc3.pdf?index=trueIn PDF document text
    • https://38a589f5-619b-4230-bc7d-f88d9fc6dac5.filesusr.com/ugd/392051_879112cc730948489725b9bbd1ed57e9.pdf?index=trueIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_ad88eddae99140838d6b7901dbf62086.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_c873bf3ff81c49e3b7ef57863ac32d25.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 5980 bytes
SHA-256: 78ea18b7a463e159c43c20c42821ff0941b19da0cbfe8554a24e15f3a8157bc8
font_01_sfnt_off00011f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 12508 bytes
SHA-256: 519408dc8b6b38b71be811e4c94840a5c9d133986aa04865e35eb26a180242f0
font_02_sfnt_off00014a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A24 16060 bytes
SHA-256: b10e7a0583bf6b216a5471aeed10f14210f1dda3adb60ac5169fcb38ba12e60c