Malicious PDF — malware analysis report

Static analysis result for SHA-256 98eb8a6d6c292b32…

MALICIOUS

PDF

81.7 KB Created: 2021-02-16 18:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b27f56a7620d6835e4a57f05e5508baf SHA-1: faf446d53eb5e2756afba83b9f1063ca55dabd07 SHA-256: 98eb8a6d6c292b32eafed9348297945a7d69e4ca19858c13c98f63bb3a1f6e12
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding that it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a URL that appears to be part of a link farm designed for SEO manipulation. The presence of numerous external PDF links further supports the conclusion that this document is part of a phishing or scam campaign, likely aiming to redirect users to malicious sites.

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 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.
  • 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=article+writing+jobs+in+pakistan+online In PDF document text
    • https://cdn.sqhk.co/wikelere/ihijhhw/81257091906.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/4iarPu6/lenovo_thinkpad_x1_carbon_gen_7.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/e1o8WtA/kizowani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_60194ad670255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_601d786c73e55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fcd63acb7ee9.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/8hhrDhi/38632749725.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/hGQBojh/john_wick_snowball_fight.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_601d4b4fa68cb.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/chdohbM/damizepepis.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/41e34f87d.pdfIn PDF document text
    • https://cdn.sqhk.co/fifenije/inrighd/ordinal_data_qualitative_or_quantitative.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/vgcDkdG/gumball_watterson_mom.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/dHx5gig/reboti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 5248 bytes
SHA-256: 0f39bfbbbd47ba290c785fb5824ff18e34f3926f5d578606a9dd878f2fad844c
font_01_sfnt_off000104b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B2 11388 bytes
SHA-256: 33bac4be0ad86e3b64e1ce79e391282dc44c098fba21a641bee932c3790901f8
font_02_sfnt_off00012b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B47 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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