Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c7a2551578a10a…

MALICIOUS

PDF

73.6 KB Created: 2021-02-08 07:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 27c051f753b3e1ddabb3a2614b67a2ce SHA-1: 836d927d5ecac9351b36dd087f7aa240b0dc1343 SHA-256: 31c7a2551578a10a5b389eebfc7d706b648abf209c5796e0499332408f1ffddb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wb?keyword=coeliac%20disease%20diet%20pdf PDF link annotation
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/jurafelezijo_limoduseserop_nofovilibego_sijoxopisukifa.pdfIn PDF document text
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/tubolusuru-libawutegu-pitibipupok-libosuburepomek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_60205529be603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_601af442ac126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_5fd1b4ed7238e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_6018bbf813823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393361/normal_5fd07df928f1b.pdfIn PDF document text
    • https://dasatupulike.weebly.com/uploads/1/3/4/1/134131314/b73eb7a73.pdfIn PDF document text
    • https://nepigisebax.weebly.com/uploads/1/3/4/4/134477897/2948390.pdfIn PDF document text
    • http://aicberg.net/89129601611kk0o0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382617/normal_6015b46669e89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472486/normal_5fd805f339c6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411931/normal_5fe84a77a1c08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_601590036dc2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fe3f14a650ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464521/normal_5ff5f7ed55c6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 4960 bytes
SHA-256: 799aa6d246da18665bc87de7d7e96afe1a525a0a0715c10d4e5aed82d42a3365
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 10200 bytes
SHA-256: 6e4dee06116d66e59b30c820b9d69b77bca8b088445f0636c5181b2c0be2a270

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