Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e252cf1afb2a2f2…

MALICIOUS

PDF

75.8 KB Created: 2021-02-19 09:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abe7ede3f15a655efc01a7c225847dd1 SHA-1: 7b4d9c2d6971deeb6b3068b4812a8a7fa6359b00 SHA-256: 6e252cf1afb2a2f2734b03bc8b80ea87f5595f1ff9cae07998b7510d49a217dd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=foxface+hunger+games+actress
    • https://static.s123-cdn-static.com/uploads/4484633/normal_5fff23ba51cb5.pdf
    • https://static.s123-cdn-static.com/uploads/4379612/normal_5ff3a0bd3f228.pdf
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5ff03ff412f4a.pdf
    • https://static.s123-cdn-static.com/uploads/4420743/normal_5fdd65cc10c91.pdf
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/605618b.pdf
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/karivisep.pdf
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5fd1c5b288e80.pdf
    • https://raguloduw.weebly.com/uploads/1/3/4/0/134041620/1667a.pdf
    • http://temppicture.xyz/nilabopisscewm.pdf
    • https://cdn-cms.f-static.net/uploads/4410975/normal_602a8a3aa2864.pdf
    • http://tortomsk.ru/51089402304bdfcg.pdf
    • https://cdn-cms.f-static.net/uploads/4407781/normal_6010fe6490d3b.pdf
    • http://hookup666.site/que_es_cacosmiauyrl4.pdf
    • http://rubka.space/ganinuvikenojajupozidfqdlf.pdf
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/jupinadidewufuk_luxegukunaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sigobija/jubatufu.pdf
    • https://s3.amazonaws.com/rudelazifizuvo/48378340839.pdf
    • https://s3.amazonaws.com/zesotat/sarcoid_pathology_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec80.bin
74e68f7a90996fbad90d82d37d5657d278b4c85620da651ea24d50f31461229d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 5284 bytes
font_01_sfnt_off0000fe5f.bin
f1bfcb5cba265141db16552bc8709eef79691b2d7b0a086d6f06b1b5b9d19e68
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 10364 bytes