Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c67678538652a1f…

MALICIOUS

PDF

73.9 KB Created: 2021-02-26 03:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c57fa3b683607485707f4d16b0dccd44 SHA-1: 24e67a7338dcf948cb2be56e08d294a33390ba8e SHA-256: 6c67678538652a1f011f5d04ac28c6bc64e6e0ed71a884497af7d4b9022dc378
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains numerous embedded links. Several heuristics indicate it functions as a link farm, with many links pointing to disposable hosting and one specifically identified as a redirector to known malicious infrastructure. The presence of embedded links suggests an attempt to lure users to external, potentially harmful, sites, likely as part of a phishing or malware distribution campaign.

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
  • 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 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.
  • 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/strik?utm_term=the+skinsaw+murders+pdf In PDF document text
    • http://timelessdecorum.com/ansys_hfss_19_free408cj.pdfIn PDF document text
    • https://podotetu.weebly.com/uploads/1/3/4/0/134017986/fanuxidafixaj.pdfIn PDF document text
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/cce729e45.pdfIn PDF document text
    • https://bakemelufipunuj.weebly.com/uploads/1/3/4/8/134888112/vekabubuwokulot.pdfIn PDF document text
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/176bfd787fce.pdfIn PDF document text
    • http://ru-dev.xyz/9_snf_fizik_konu_anlatm_indirlacxr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5fd1f6c929039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_602b3ab90cd35.pdfIn PDF document text
    • http://copyright-helps-team.com/39278346798w4v3p.pdfIn PDF document text
    • https://jumuvive.weebly.com/uploads/1/3/0/7/130776409/de31020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420028/normal_602f219aaeae3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470226/normal_5fe3941b98828.pdfIn PDF document text
    • http://axecheat5.xyz/the_golfing_machine_downloaduv4k2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501495/normal_5fdbe460ddd72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowenoji.rf.gd/46502694644.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 5356 bytes
SHA-256: fb1ae4525d6c6000b91857f7b860011237ecd850eb127c21f25ea27b610ae890
font_01_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 11212 bytes
SHA-256: 8af62d136877459ea3884428b38150df296e24b6e4f99defc181cd24fa41a7cc

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