Malicious PDF — malware analysis report

Static analysis result for SHA-256 5317046f6351107d…

MALICIOUS

PDF

79.1 KB Created: 2021-03-17 07:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fa642f1c46199d82eb52411870421552 SHA-1: 266f6affa59574838243ab7882acd33051d7f671 SHA-256: 5317046f6351107dd1c4a766aca8dbb080d68a3a461d9c92c4c4d6fc3cf7fa87
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/wix?keyword=practice+worksheet+net+force+and+acceleration+answers PDF link annotation
    • https://poxuroli.weebly.com/uploads/1/3/0/7/130738943/pavoxuzelozabixuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/duburijudi/uicAtE2/word_games_word_connect.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/4998eae8349.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496204/normal_60085ff74d4d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_60377d21f088f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444356/normal_5ff995e3da84a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_60336b583b4a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404512/normal_6019ccda6075f.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/iagcgcC/download_solid_color_wallpaper_pro.pdfIn PDF document text
    • http://securityverifiedservices.com/georgia_drivers_license_number5dmt8.pdfIn PDF document text
    • http://prizinsta.info/90675784080h1qid.pdfIn PDF document text
    • http://reawolt.online/stanley_wet_dry_vacuum_replacement_bagsauf06.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/jzljcgd/tuwujijixag.pdfIn PDF document text
    • https://menerixejujup.weebly.com/uploads/1/3/4/6/134605313/gexade-fivipudogiz-pijirimal-pajipexebip.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/hjTiegh/joplin_ef5_tornado_path.pdfIn PDF document text
    • http://phrensy.co/seguxadojunakusozemijumanz1js8.pdfIn PDF document text
    • https://cdn.sqhk.co/lijedubejop/UXmrEic/95342519241.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://famojil.epizy.com/19770777677.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_2fec6ad4b81643f08d0edec3af452a85.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_4ff8a35a5d9748c9822c7a3215c96755.pdf?index=trueIn PDF document text
    • http://fabomisibis.rf.gd/endocarditis_guidelines_2017.pdfIn PDF document text
    • http://werokixa.rf.gd/blue_eyes_technology_wikipedia.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_3a008c5b9b724da1be772d550cb3efa5.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_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 5268 bytes
SHA-256: 0cc77b422ca728d0024954d93d016c3d8ee5b83e82c63346408e82f023784a87
font_01_sfnt_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 10808 bytes
SHA-256: 9b84ec92dd6ee1b0664e58f7cf1c45495a7b4a15d098751ef4297363a5084b0c