Malicious PDF — malware analysis report

Static analysis result for SHA-256 7127045cd99771d9…

MALICIOUS

PDF

75.6 KB Created: 2021-02-24 00:30:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 985103905e47d478fa603cb777a5a4f3 SHA-1: 54ff3be9f595e744f3ead8577d9408e03536d759 SHA-256: 7127045cd99771d95230a082f13d080fce095b699019a23084d858765a8db78f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=who+is+an+infj+most+compatible+with PDF link annotation
    • https://cdn.sqhk.co/pujixefan/5gcjfnC/love_poly_new_puzzle_game_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fe7759812d89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5fd61b074bd77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491157/normal_6026e2e1bd861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_600b8dc456667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5ffa528b2807e.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/xeluxo_fuvimegewiv_lelawiri.pdfIn PDF document text
    • https://cdn.sqhk.co/lakisitu/YyMdhUV/biluxatunawuzar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408588/normal_602353ae9f2ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_600e77360bb1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_5fe9fca87c455.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/jovekus/bugejeworidovodigeso.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/cambridge_ib_chemistry_textbook_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 4648 bytes
SHA-256: 7dee9bb2fe7683acdcfeace5cbc3531c7839bdc9004d21faba05131cac027f63
font_01_sfnt_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 5480 bytes
SHA-256: e796f0e918e0ce7269c8cd6b33eb902587726145de4accea19a5b49001ab6aec
font_02_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 12496 bytes
SHA-256: 3deb34ba640ba14317ad3920adf4b144a32d8267c1a8c0649afd791244910c93

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