Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4d2d0dfc1bf327…

MALICIOUS

PDF

92.1 KB Created: 2021-02-16 13:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7ba1bace1a5d4a2bc4bb273d958f63a6 SHA-1: c98a80a6fec2a6b26d87f90a13518d15d9f404ef SHA-256: ff4d2d0dfc1bf32719e81ac18a7ef7dc98869e5b5792766117f69e7a3699d80c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to potentially harmful sites.

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://baarspo.ru/123?utm_term=tintern+abbey+explanation+line+by+line PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476453/normal_601e6811229fe.pdfIn PDF document text
    • http://kewegagibemidaj.22web.org/bizudavojapokebi.pdfIn PDF document text
    • http://gotesesevuzi.iblogger.org/senobuwuwekemuximubodewe.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/jaha1hi/98755419996.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/QIXicxK/rodumuxarumifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_60287178552da.pdfIn PDF document text
    • http://dupomixu.iblogger.org/pandora_strand_bracelet_size_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/eR3xEDx/fefaxumoworajoweb.pdfIn PDF document text
    • http://lusanubi.22web.org/garewezapexegopanizokaxip.pdfIn PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/1501278.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/rjhUKqH/xotaxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393754/normal_5fdffdfd736fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491451/normal_5fdc331e60a05.pdfIn PDF document text
    • http://vofuvomo.iblogger.org/pafogupodeba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fagorawed.rf.gd/factorio_guide_to_belt.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/bodyguard_2011_movie_hd_free.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_off00012f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 4892 bytes
SHA-256: 5c7f84d6b0a0e9a0664ba59b9ae4cebf67c176ebe24f226b90a931e9da81de90
font_01_sfnt_off00014009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 10152 bytes
SHA-256: 912249f991e7a9ddd3895fc582b138891a08653d93ace9ca9b303722d41462f0

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