Malicious PDF — malware analysis report

Static analysis result for SHA-256 4735164baa70bf0b…

MALICIOUS

PDF

87.2 KB Created: 2021-04-12 20:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 666414bdfa4c535567213ee6c4e5dd94 SHA-1: 7880fbb0b3c5b10382316a71bdb23c1177ff2441 SHA-256: 4735164baa70bf0b291804787ed20b058896767fe2bee5193c068f5c6dc5f4e4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or link farms, indicating a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xezojetit.ru/strik?utm_term=krups+egg+cooker+amazon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386605/normal_5ff49141ab1af.pdfIn PDF document text
    • https://cdn.sqhk.co/kibukumivu/TierTa9/jexiboxola.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/bsf_tradesman_recruitment_2020_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_605af2612ac18.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/jb2vghc/fractions_decimals_percentages_ratio_and_proportion_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/ghgvggI/baby_panda_ice_cream_shop.pdfIn PDF document text
    • https://cdn.sqhk.co/givujelised/ejhiJZV/nc3_bookkeeping_reviewer.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/ghcO4ii/62603717996.pdfIn PDF document text
    • http://migerov.xyz/battle_ops_wallpaperqzv9o.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/93321684084.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/8jhPMUJ/best_battery_christmas_lights_outdoor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_600d32d1e5b33.pdfIn PDF document text
    • https://cdn.sqhk.co/linigurep/chenEii/12122076435.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/2ggI3hj/cnc_router_table_5x10.pdfIn PDF document text
    • https://cdn.sqhk.co/kebabefepu/cC5ahev/55489992174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479675/normal_60467673a4278.pdfIn PDF document text
    • http://natural-shop.info/958919949732klp3.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/jfx0Wje/riverside_california_criminal_case_lookup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zedebegeku.myartsonline.com/catalogue_chauffage_daikin_2020.pdfIn PDF document text
    • http://zuputes.atwebpages.com/19131583192.pdfIn PDF document text
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_46d7216ae9e64b4fa333792ddbdbdbfc.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_fcd44051fa5a4cd882e8abc602db2856.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_417a841251354ff19c744196ee181ffa.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_74db4af9d3a144c18d54adc51a3fc369.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_1a8499aed6a841609655c6d9fa7bc4bf.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 5060 bytes
SHA-256: 9f8aaf7ce44e476a7a8642342aeac43943897d1ada2d4f59c54680a7615eafa1
font_01_sfnt_off00011bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEE 10452 bytes
SHA-256: 3996e55b82b25ceb31dfd299c3be4082ff24799990885cc783923510bd3a1a1c
font_02_sfnt_off00013f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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