Malicious PDF — malware analysis report

Static analysis result for SHA-256 43aeab9815a05841…

MALICIOUS

PDF

84.8 KB Created: 2021-04-25 10:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96b7a89852fbd830828c12f2e3a15c6b SHA-1: a537a920451831bd67369279790f26d895a3f0c1 SHA-256: 43aeab9815a0584194799c90f5a8e4875d2c487b36be86c7d9d27473a3489637
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The embedded URLs, such as 'https://lozipotod.ru/strik?utm_term=salary+data+science+manager', are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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 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://lozipotod.ru/strik?utm_term=salary+data+science+manager
    • https://cdn.sqhk.co/mejofiwog/gvFieCr/93846092252.pdf
    • http://tadosuzewamu.medianewsonline.com/tocqueville_the_old_regime_and_the_french_revolution.pdf
    • https://posokirotol.weebly.com/uploads/1/3/2/8/132814476/53d6775f.pdf
    • http://sandiego-podcasts.com/american_assassin_trailer_reaction4pc1b.pdf
    • https://cdn.sqhk.co/kitaparek/j8ig9hf/rifezofewanagasaj.pdf
    • https://jawokisejul.weebly.com/uploads/1/3/4/6/134601468/mopodiligufujofop.pdf
    • https://kipowiginudi.weebly.com/uploads/1/3/1/3/131383469/7609698.pdf
    • https://dowixedazu.weebly.com/uploads/1/3/1/4/131409709/borunakim.pdf
    • http://dirtygirl.fun/23618650148jvr1o.pdf
    • http://tramlaweq.online/99342035237ywg7t.pdf
    • https://cdn.sqhk.co/givifevulo/ijgghXw/64719537133.pdf
    • http://wejaduz.mypressonline.com/biology_notes_for_class_12_cbse_download.pdf
    • http://kujunat.medianewsonline.com/environmental_awareness_book.pdf
    • https://cdn.sqhk.co/piwewupovo/hagdy5Z/46536858312.pdf
    • http://youla-24.cc/how_to_start_a_craftsman_lt1000_riding_lawn_mowerax2jr.pdf
    • https://zivumabozado.weebly.com/uploads/1/3/4/8/134858695/60626.pdf
    • http://gogogoinst.xyz/coleman_spa_model_471_manualpem9p.pdf
    • https://cdn.sqhk.co/zepipawetopi/b6I4aia/pico_rivera_car_wash.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_bfa89da868c64a889a6ee472f00f723d.pdf?index=true
    • https://s3.amazonaws.com/libusamagowuvo/which_online_business_is_most_profitable.pdf
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_1d28d87340814646a1a669e152d22769.pdf?index=true
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_02660d71b0564f1b9c1570d4e19a51f8.pdf?index=true
    • https://s3.amazonaws.com/fadupazageraf/foscam_fi9900p_factory_reset.pdf
    • https://s3.amazonaws.com/wixanarer/42299774730.pdf
    • https://s3.amazonaws.com/roware/tulufixaxoja.pdf
    • https://s3.amazonaws.com/zazelujeju/the_family_man_full_movie_khatrimaza.pdf
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_a1efa2efaf71435faec5b6fd8a4b6fc2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bf3.bin
7c4becb54f01b09b4ed457c276540c6fc86916357b65a61dae30e9b32240c4c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 5464 bytes
font_01_sfnt_off00011e78.bin
5e4cc08f60a4f83ce3e055b5d70731b7bc8f894577c37637519de9d10a5bba96
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 11516 bytes