Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afb40891b1225a1…

MALICIOUS

PDF

82.6 KB Created: 2021-03-09 22:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 057e3b5b9a876802e307309bb0e204c7 SHA-1: e0b836f00f1e5270185187e1993a7d597150fec2 SHA-256: 9afb40891b1225a13bca838c0d33661c0b141cf1558b36582a5489756563fa9a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://golowaki.ru/award?keyword=chemistry+atoms+and+molecules+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423750/normal_5fce18f65940f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_603537039daa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_5fd7cf253afe2.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/estudios_biblicos_para_la_vida.pdfIn PDF document text
    • http://dalnoboyi.xyz/64013250057i12c3.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/jejerigiravovosegelejofe.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/how_to_draw_out_a_blackhead_in_your_ear.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374704/normal_5ff35d26d1849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_60172f258d68c.pdfIn PDF document text
    • http://digitaloffice24.ru/brady_tls2200_manuale_italiano1qumg.pdfIn PDF document text
    • http://talkme-news.info/starfall_abcs_gamesfmiso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500189/normal_5ff209a122495.pdfIn PDF document text
    • http://svarka-aurora.online/infinity_train_characters_tier_list5ajwg.pdfIn PDF document text
    • http://pedrons.space/71838229455a9aec.pdfIn PDF document text
    • http://eurofamily.pro/dipaxanofoseroh4du.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365608/normal_5fe0b8d3164f9.pdfIn PDF document text
    • http://vitonidero.medianewsonline.com/jazzy_select_elite_parts.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
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_16eac7d0c1ba4c039d30ce99fa4adf60.pdf?index=trueIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_74b5ef800cab45f6a7595b5e923d0531.pdf?index=trueIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/93859722585.pdfIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_e8fec15859ba49938158f4e217fc9935.pdf?index=trueIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_bc76e346fcf94541811abc70c725fd6b.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_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 5404 bytes
SHA-256: 85bd0a451ac99147b97bfebcf9e1fad236d91dbfca37893c49fb13d40db455fe
font_01_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 10752 bytes
SHA-256: c804684bf29e77e426869eeac59f444258a9b8a4d9958d452496974c16c00eaa
font_02_sfnt_off00012f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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