Malicious PDF — malware analysis report

Static analysis result for SHA-256 907373c9723dbf21…

MALICIOUS

PDF

122.8 KB Created: 2021-05-29 13:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 10b912e8aacae5c0678b764b77cefeb6 SHA-1: e5ace7691799cb8ee9cbafc26f632fbf8486c9b0 SHA-256: 907373c9723dbf21b1784c64024a5cc0cf5df4e275556eaaab2abd8f0d678513
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, 'https://seumenha.ru/strik?utm_term=7+spirits+of+god+bible+study', is likely the intended destination for users, disguised as a Bible study resource. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=7+spirits+of+god+bible+study PDF link annotation
    • https://vipugexisixow.weebly.com/uploads/1/3/0/7/130775501/mejekogirunodafuzol.pdfIn PDF document text
    • https://bumilumijoxaxuv.weebly.com/uploads/1/3/4/4/134497753/pitufawabivubudexezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452612/normal_601040a4b6200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469847/normal_5fc8dbb4e40aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_60165c4f86e43.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/4268487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_604dbccb022a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_6057190406f86.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4458840/normal_60b1ae5fab7a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_6033b70f8d1d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_6016826f9e590.pdfIn PDF document text
    • https://bakijowo.weebly.com/uploads/1/3/4/7/134726649/cc14b04.pdfIn PDF document text
    • https://kefuluseze.weebly.com/uploads/1/3/1/3/131398598/632ae2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_60493f318b9c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a37066-1f0a-472c-9624-b7aec202a33d/17562668831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e5e5427-10b1-4642-8adf-c18f4f75812b/88193075973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d2ce21-613f-46b4-ad89-f72decbf7ee7/basic_french_vocabulary_words_in_korean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8dc3a4-b952-4a9b-800a-3dfa364a6b69/how_much_surah_in_30_para.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49190859-409b-42da-8ff4-617cf55ab72f/dasuguvamuzofewukakimef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4d28d2-fb1c-4a24-9101-d81cd74bdd74/autocad_2007_tutorial_electrical_engineering.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_off0001a406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A406 5224 bytes
SHA-256: 327c27adbb82c78582f2b56101c36385bad7263ab416834f9ec482949bf3782f
font_01_sfnt_off0001b5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5E7 11764 bytes
SHA-256: 77a199871646a2f4872277626e5b54895c6f25e31500ae5f9e64d45a3d8ac755