Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61e9dd4dce8b136…

MALICIOUS

PDF

75.3 KB Created: 2021-04-04 13:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ef4cd9103830a77cfe31078217cc8699 SHA-1: 29665513c68a2d5c4e37ee9f11056c4e4bd3d0ca SHA-256: c61e9dd4dce8b1361e6c8245378981833e441e6fc6b232953ddb10e74ea08acb
186 Risk Score

Malware Insights

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

This PDF file was detected 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 it is part of a link farm designed to drive traffic to potentially malicious sites. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=vampire+diaries+books+plot'.

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://resalured.ru/strik?utm_term=vampire+diaries+books+plot PDF link annotation
    • https://vokavubibobudew.weebly.com/uploads/1/3/5/3/135316357/mozababa-puvom-nelivolone.pdfIn PDF document text
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/202785.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368997/normal_5ffb98cfc6794.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/ijejfaP/97095520040.pdfIn PDF document text
    • https://dawitomow.weebly.com/uploads/1/3/4/4/134439013/7963277.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/jdOYthg/beholder_2_apk_obb.pdfIn PDF document text
    • https://lewuseloti.weebly.com/uploads/1/3/1/4/131437615/fanezovawuxejisuwi.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/90692363028tlw0h.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/bakovatolefabavor.pdfIn PDF document text
    • http://hurleyshamburgers.com/gazoxusepiliruwpydlx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5fdc81391eb50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383444/normal_5feb8085f2b0c.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/MenjcyG/bubbleland_laundry_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1c07d4e-6587-4767-b76f-5dea9cf3e327.filesusr.com/ugd/51a829_6dfbd4e944424b7c96d1574810fdf0f8.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_28cf3936396e4564887baf6ccda4d7f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/annotated_bibliography_examples.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_67044e4231a042ffb2bb141e9c1b339e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vutame/veg_recipes_free_download.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_c5c63aeb307f4286bf6349ce75946464.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/90986891149.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/rofuwekamelupowa.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/why_is_my_mitsubishi_aircon_not_turning_on.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_3f3210e889824ee98c7ca48087b99b81.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_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 5272 bytes
SHA-256: 93ac2e95e7e313fd6dc44b2f831d9e257f8bb173f307578e8c6a28d960212b73
font_01_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 10532 bytes
SHA-256: e0e1559b02e07f619613d224b2abc35658dce14ecf6386bc6c842da3d4e44bdc