Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bf89765e940ffd…

MALICIOUS

PDF

74.7 KB Created: 2021-05-16 10:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 561ca8f7f36648f577f611c8f63bc90c SHA-1: dec3e057cecfc0708b6808583463587d75c06262 SHA-256: 77bf89765e940ffd3b1eb3d7e73a3800856c8652841cf0508f4356bf28209479
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://jottigo.ru/strik?utm_term=2001+chevy+1500+stereo+wiring+diagram PDF link annotation
    • https://cdn.sqhk.co/lepavenujal/utha22L/ben_10_heroes_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/zegareguw/gfX8hbX/2314454095.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/functional_text_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/fekepazerox/PGFhh2L/wotetuxurigafeso.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/durga_saptashati_telugu_gita_press.pdfIn PDF document text
    • https://cdn.sqhk.co/modebopogut/iJXhhja/2488886058.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/rezokefaxo.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/nadodivixigu.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://s3.amazonaws.com/setaxilitozuko/zivenenezozowi.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/25260008679.pdfIn PDF document text
    • http://sipijukat.epizy.com/12147089187.pdfIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_a3de87dd38d344a887af6d3c34823b20.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_9380c90485f048bd926cc06c254256f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/xatijokebamopojidagodi.pdfIn PDF document text
    • http://mesipupip.rf.gd/gumev.pdfIn PDF document text
    • https://deed868a-3c3f-4b0d-b3ae-f9ebe8a38c33.filesusr.com/ugd/95283b_6c87f47a68634977b159a2b465c3b7b6.pdf?index=trueIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_6a3a0fac525e4b1e810913a7ed2e1b9a.pdf?index=trueIn PDF document text
    • http://fotopokidag.epizy.com/minutes_of_meeting_template_school.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/sports_management_in_physical_education_book.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_212b50989f7d47faa3e48cb19c914a49.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_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 5720 bytes
SHA-256: 38dc04a5c9bec97b2f942af37b5b437566c960b13859d621ba16199be887b43e
font_01_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 10252 bytes
SHA-256: cfb17a75f525ae8f29c7d2dd85f5489e9aa1985a4db69a476f45e55831165acc
font_02_sfnt_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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