Malicious PDF — malware analysis report

Static analysis result for SHA-256 a311613e86949092…

MALICIOUS

PDF

77.4 KB Created: 2021-05-24 12:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ba09665a8140c5f73d444057c134e3cb SHA-1: 502853dad10e4188a44e655eba5cf516a68fd84f SHA-256: a311613e86949092aa394ffc0acd99c380ad035d105a225840f2d2b4c7281791
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to drive traffic to various sites. The document body, though heavily obfuscated, contains metadata related to PDF generation and a title that appears to be a lure.

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://botokaw.ru/strik?utm_term=flash+column+chromatography+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475727/normal_6057b35d4688c.pdfIn PDF document text
    • https://zomanuvid.weebly.com/uploads/1/3/4/4/134477829/rikejakizidefoz_gakajisezejop_guduxawepab_raluxokikeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416139/normal_6032d424516c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_605d6fe6e9094.pdfIn PDF document text
    • https://nowuvufeguxebib.weebly.com/uploads/1/3/2/8/132814980/rebewera_foxuvemimi_webuzoxu_xovijatuf.pdfIn PDF document text
    • https://jidukuroji.weebly.com/uploads/1/3/4/0/134013204/2654690.pdfIn PDF document text
    • https://roxadaxakisa.weebly.com/uploads/1/3/1/4/131437443/d7d137cc1f5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_605fe505351ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5fe0d668c2b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501198/normal_602be657c4a13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499334/normal_5fc608664579a.pdfIn PDF document text
    • https://kexejimeso.weebly.com/uploads/1/3/4/0/134096016/tiwivesizovuroju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412905/normal_6043ec4d8c5b4.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/5ba95b8ffb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416502/normal_6019a404e19f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/98403102631.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/85406376237.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/tokyo_drift_full_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/ansi_sql_standard.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_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 5544 bytes
SHA-256: eb30ef67db0652e82b6b491d31e7fdca42fab3e7aad2d2dcd70c1e0dcd636e96
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 10844 bytes
SHA-256: 3edb5f923a672cf15f3a96b0c97d651c6a9a962d559d69716d61d269abece597

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