Malicious PDF — malware analysis report

Static analysis result for SHA-256 191ed1545593cc3c…

MALICIOUS

PDF

76.9 KB Created: 2021-05-22 08:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac794189fdcb2ae8f105b2b894d05fc9 SHA-1: 4495b1e37a3d1a449dc8e5940f149b8e885755ad SHA-256: 191ed1545593cc3ce2195a55fd15d0d33b969e5eb67d40b10327318cd54e2159
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary technique being the distribution of external links, likely for phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=biome+mapping+across+north+america+answer+key
    • https://cdn-cms.f-static.net/uploads/4375194/normal_6030e90b95862.pdf
    • https://static.s123-cdn-static.com/uploads/4486367/normal_5ff9180d21c2c.pdf
    • https://cdn-cms.f-static.net/uploads/4403264/normal_600fd562515bf.pdf
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fce9e324e0f1.pdf
    • https://rawaruginoninum.weebly.com/uploads/1/3/1/0/131070401/6536579.pdf
    • https://xuzojawuwakobo.weebly.com/uploads/1/3/4/3/134312069/rosepigamip-bixupujujapu-volokiw.pdf
    • https://cdn-cms.f-static.net/uploads/4418566/normal_6016e5508fa8e.pdf
    • https://cdn-cms.f-static.net/uploads/4369779/normal_606315cc24387.pdf
    • https://static.s123-cdn-static.com/uploads/4454419/normal_5fcc6ea2b1eed.pdf
    • https://cdn-cms.f-static.net/uploads/4376375/normal_604a7c096df2d.pdf
    • https://cdn-cms.f-static.net/uploads/4421778/normal_5fdc36a500d14.pdf
    • https://cdn-cms.f-static.net/uploads/4381287/normal_603810e9cd91f.pdf
    • https://static.s123-cdn-static.com/uploads/4457604/normal_600213e58fd74.pdf
    • https://cdn-cms.f-static.net/uploads/4487399/normal_5fd262673cd3b.pdf
    • https://defaxudenuged.weebly.com/uploads/1/3/5/2/135293647/wagawo.pdf
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/8c0eda.pdf
    • https://cdn-cms.f-static.net/uploads/4505687/normal_60640ca934de1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rogugagatuf/angry_birds_games_apps.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/64049650943.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_off0000ecb7.bin
3e77e3bb06e332fd3c7b67b1382ab072eb8291cac723b4ac5219c11b8de2e265		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 5620 bytes
font_01_sfnt_off0000ffd2.bin
d26562f6f01f072f759e37e0509b3a47f18c7662e488f68118273c5270c4714a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 10784 bytes

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