Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a3e25b9a38122d…

MALICIOUS

PDF

74.6 KB Created: 2021-04-04 04:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53a6a94d3e3758f1026f994778a8b7d6 SHA-1: 7d37897a35bd31b422ab200d166b20d815ce8f35 SHA-256: 28a3e25b9a38122d86e4f0cbb4774658a72eb9025ae92066a274a90a4671fcb1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a potential link farm or distribution mechanism. ClamAV and ML classifiers strongly suggest malicious content, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external links suggest it is designed to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=weekly+diary+template+ks1
    • https://cdn-cms.f-static.net/uploads/4495269/normal_60245e9ebbe12.pdf
    • https://cdn-cms.f-static.net/uploads/4480753/normal_600b3a5ba20cc.pdf
    • https://cdn-cms.f-static.net/uploads/4499651/normal_6059984ab4af2.pdf
    • https://static.s123-cdn-static.com/uploads/4408713/normal_6001d3af7b844.pdf
    • https://static.s123-cdn-static.com/uploads/4500889/normal_5fc67930eae2b.pdf
    • https://cdn-cms.f-static.net/uploads/4417423/normal_6055295d07c3c.pdf
    • http://zelopaqq.xyz/53411140482iu7zx.pdf
    • http://psychologyrelax.xyz/campbell_reece_biologykyxxr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_4a32e856d3db49309c88bbbe5d3c0b35.pdf?index=true
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_a271fac2bab145aeb29c76e5116e372e.pdf?index=true
    • https://4c38db24-2924-4bf2-81c9-04860d987a69.filesusr.com/ugd/a68d8f_707658d3e432480296d82a6ed735823a.pdf?index=true
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_3ae2c7e6ea78416f82f1d50cb15fba0d.pdf?index=true
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_9715e17c5d1b4a4d8e7fe8b535cbf32c.pdf?index=true
    • https://s3.amazonaws.com/xufujofaleki/95719459099.pdf
    • https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_1b1117edeb2740c198350215e85a58eb.pdf?index=true
    • https://s3.amazonaws.com/fulazelof/88497026627.pdf
    • https://s3.amazonaws.com/lorifawuvawot/huntsman_knife_fade_guide.pdf
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_9873329b2bcf4fe6b1104a210c0dd6b7.pdf?index=true
    • https://s3.amazonaws.com/bejenosugede/intesa_sanpaolo_life_annual_report.pdf
    • https://s3.amazonaws.com/jotizifime/66211730459.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_off0000e712.bin
27032b979e221af0b626bcf2d787ff2722d8e1993325ac5444e9b527b5feabeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 5336 bytes
font_01_sfnt_off0000f93d.bin
b2c87419d039e010fe7a1a24e7e0c731a7d5b8b9802ebf1071e493f30d63db85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 10608 bytes

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