Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c81630e52cf6e6…

MALICIOUS

PDF

74.0 KB Created: 2021-03-21 06:23:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ff53279f9f778fc222f1e50e322bbcc6 SHA-1: 416b6b7fa1ef18eabb65c9187bf7adf7326c749f SHA-256: 48c81630e52cf6e602c07ccecbe688d103505ee3e8eddd940fe62d25c7051c0f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=organizational+behavior+mcshane+7th+edition+pdf PDF link annotation
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/a8493b20fb0fd4e.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/jfibvih/25635854137.pdfIn PDF document text
    • https://cdn.sqhk.co/midubevine/dihggih/frontline_fury_grand_shooter_apk_mod.pdfIn PDF document text
    • http://perevod24-card2card.site/what_college_degree_do_you_need_to_be_a_real_estate_agentm014u.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/gjhFdfw/balance_sheet_of_amul_company_2018-_19.pdfIn PDF document text
    • https://cdn.sqhk.co/mubogasaven/aIijCij/78152733229.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/nelson_stud_welding_n4s_manual.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/4818215.pdfIn PDF document text
    • https://cdn.sqhk.co/kizewetete/FqShgcR/zekelex.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/JghLmhf/popomexe.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/advanced_java_all_programs.pdfIn PDF document text
    • http://gooddevice-online.com/58668652720bn2r2.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/rGkhahe/raft_survival_simulator_apk.pdfIn PDF document text
    • http://dipunag.getenjoyment.net/comment_draguer_une_fille_par_message.pdfIn PDF document text
    • https://cdn.sqhk.co/tinajugezepi/iccgedC/fast_racing_car_3d_simulator_apk.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/socioeconomic_status_and_education.pdfIn PDF document text
    • https://sepolekabu.weebly.com/uploads/1/3/1/6/131606201/daziwu.pdfIn PDF document text
    • http://floradoma.net/18456303627khy5y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_b48462e003964fb5baad5a88347792fd.pdf?index=trueIn PDF document text
    • https://229013d5-0e14-4531-be8c-43df84542e77.filesusr.com/ugd/e4a895_62b5e790a00a46e08f6fd5e6c398b34b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 5924 bytes
SHA-256: 56a956a26a9f808cd8210840480c550b03a61786a599d84aa63d1d8b7f7ddfb8
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 10964 bytes
SHA-256: 46c4694a4f11e4045b7b9f9c26e3c6786904de522eda87abdfad7d09b5f75888

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