Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6b86b48a7a350a…

MALICIOUS

PDF

72.4 KB Created: 2021-02-14 11:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ce2ff89e709b49e28528114970b3921e SHA-1: 3d15dea0e076c638e263558fdfd90ea346adc274 SHA-256: 8e6b86b48a7a350af8c5d31e454b703d6ea6d94b1878258a6d23fdc7104465a7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure at 'https://yafferge.ru/'. Another heuristic identified the PDF as a link farm hosted on disposable domains. While no scripts were extracted, the presence of malicious links strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=define+direct+characterization+in+drama In PDF document text
    • https://static.s123-cdn-static.com/uploads/4460457/normal_600924ae84645.pdfIn PDF document text
    • https://cdn.sqhk.co/muwesisokim/bfjaict/53237573197.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/5330480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_60273a21797a6.pdfIn PDF document text
    • http://wisevajiliji.22web.org/facebook_photos_with_metadata.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/ggYjfS8/nexogizamiwebikebojodav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5fd135ee176da.pdfIn PDF document text
    • https://nezasofesaz.weebly.com/uploads/1/3/5/9/135961661/dusase_ramorojenuvu_sasulevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458839/normal_5ff35fcd7d30c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://warufadul.rf.gd/nizukalejaratunenukiwofuw.pdfIn PDF document text
    • http://binawojojin.epizy.com/13939247001.pdfIn PDF document text
    • http://jipowefata.epizy.com/neet_biology_question_paper.pdfIn PDF document text
    • http://wadafitukaleka.rf.gd/fovamuporumusugi.pdfIn PDF document text
    • http://gezewezelatemak.epizy.com/paxiwovikusudewuxus.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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 5100 bytes
SHA-256: 92192c86947ffcf6b510be18adadafe992fe77315f22368b266a7282671c0ed3
font_01_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 10632 bytes
SHA-256: f6a27eb801fc1c54eaf619590f4bb901b3b8bd58231bce3dac05399fcd94bb3a

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