Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acf1a2842d595f1…

MALICIOUS

PDF

77.3 KB Created: 2021-04-21 19:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 21d01b39d5b1ec9c3f5d55026067ec46 SHA-1: de969c3db53f58a058818b3fd14cb264afcf3c08 SHA-256: 2acf1a2842d595f1cf87354605599dd09223710b69c90a588ccfa7fa41687795
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=how+many+watts+to+power+a+5000+btu+air+conditioner PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5ffadb73df053.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/QmichfQ/xpert_eleven_football_manager_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/hbvihjd/coco_bubble_tea_menu_calories.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/hdXzphe/39669229636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484807/normal_604a27382606e.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • https://cdn.sqhk.co/supopareso/bZieghi/mob_xp_farm_minecraft_1._14.pdfIn PDF document text
    • http://leqqurint.online/1183005626n5p81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_5fde65d177052.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/1e3jikB/81201817793.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/jaI5vgj/gurexi.pdfIn PDF document text
    • https://cdn.sqhk.co/zugeketinog/iifQMge/snack_video_short_video_funny_video_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_60357c7d2576a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368497/normal_5febbfd6e154d.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/bijZijG/66040393523.pdfIn PDF document text
    • http://rozowoxov.22web.org/69056558113.pdfIn PDF document text
    • http://dream-stat.ru/tomaselidikaluqi4wb.pdfIn PDF document text
    • http://freedate18.xyz/55893642319dwztq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_d5e4188ef53f4970986daf5e64fd3684.pdf?index=trueIn PDF document text
    • http://sisubupofi.epizy.com/account_coordinator_job_interview_questions_and_answers.pdfIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_695566e50d0b475e9b3c72303fbd8ac2.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_1690a617c2af49159079979ef6057d55.pdf?index=trueIn PDF document text
    • http://povuputuk.epizy.com/ferivukipofekovatozopebib.pdfIn 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_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 5748 bytes
SHA-256: 96983063bfac8af01f54662865aa94fe11c735a93c48a8324a5231795ce3c0ff
font_01_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 11180 bytes
SHA-256: 9ad97b9d41051fb46c9db74583a9ed16552e65b8164eb75d26ea8313f49cb508