Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab725c8c52e915d5…

MALICIOUS

PDF

81.9 KB Created: 2021-05-24 03:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0866e76fe49bf808a70c01e6704d0a92 SHA-1: 501bc3436fc2fd2c7d70409a89ad8eadc9d6a26b SHA-256: ab725c8c52e915d545aee148e3ab2ef21eafaaa0accbcac521d55a1c486b9b6d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to Weebly-hosted PDFs, suggests a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious content delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=what+makes+shylock+a+villain
    • https://ximipozatapemo.weebly.com/uploads/1/3/5/2/135297631/virunezumukav.pdf
    • https://minajekefejuwow.weebly.com/uploads/1/3/0/7/130776819/7081135.pdf
    • https://cdn-cms.f-static.net/uploads/4391335/normal_6059fbe09c919.pdf
    • https://webebusili.weebly.com/uploads/1/3/0/9/130969565/falavegi_rozaxami_jagowerix_wizibetuz.pdf
    • https://pajejasebuwosiw.weebly.com/uploads/1/3/0/8/130813778/pupivukomadodek.pdf
    • https://namewedopuso.weebly.com/uploads/1/3/4/5/134583017/rifaxevosave-disizebu-xapij.pdf
    • https://cdn-cms.f-static.net/uploads/4393639/normal_60402e9b8a4e3.pdf
    • https://cdn-cms.f-static.net/uploads/4471249/normal_603b8f803540b.pdf
    • https://zaxifugerabapaz.weebly.com/uploads/1/3/1/0/131071175/zapakopujop.pdf
    • https://cdn-cms.f-static.net/uploads/4455673/normal_60498ba29cad5.pdf
    • https://cdn-cms.f-static.net/uploads/4500877/normal_605c8f3ec4075.pdf
    • https://cdn-cms.f-static.net/uploads/4425759/normal_5fd67b324244f.pdf
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5ffc9d5fa406e.pdf
    • https://static.s123-cdn-static.com/uploads/4374951/normal_5fe5927914f0a.pdf
    • https://cdn-cms.f-static.net/uploads/4425929/normal_601d12c771dc6.pdf
    • https://ninuwekij.weebly.com/uploads/1/3/4/6/134625354/zoduj.pdf
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5ff9baec6932e.pdf
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/xesuverawet.pdf
    • https://cdn-cms.f-static.net/uploads/4413228/normal_6018a4bef051e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sojebelevenex/91341036869.pdf
    • https://s3.amazonaws.com/baxekojojexusol/jasper_reports_documentation.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed85.bin
b86433911dfb846e0e3e4303bb244f92336ee0cd696ba3948ace9b1cf777b4d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 5180 bytes
font_01_sfnt_off0000ff15.bin
5d703f36aefaac9a1a3f51c3a6038b8d16d43ccb242dec1ea5458a04b44628fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 10840 bytes
font_02_sfnt_off000123bd.bin
e55875cdf85fb13d043b292e8b8f3614dea4d448d0d8500cbb1c82a5ad91d8d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123BD 16104 bytes

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