Malicious PDF — malware analysis report

Static analysis result for SHA-256 60119d707ce69a7c…

MALICIOUS

PDF

73.5 KB Created: 2021-06-08 05:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7af8fecf215f39bede705c68858b895 SHA-1: e18f5f20cb3bfd604f171ec95b38aadeec57c298 SHA-256: 60119d707ce69a7cb76a2a35d174efa070384fdd14de6bee6655d1a634965329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on services like Weebly and pbworks. The primary URL, https://philabc.ru/pbw?utm_term=les+adjectifs+possessifs+exercices+debutants+pdf, suggests a lure related to educational materials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to manipulate search engine results or distribute further malware through the linked PDFs.

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://philabc.ru/pbw?utm_term=les+adjectifs+possessifs+exercices+debutants+pdf
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/9f6d890a1.pdf
    • https://cdn-cms.f-static.net/uploads/4387226/normal_604894226322c.pdf
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/balaboliselaxi.pdf
    • https://static.s123-cdn-static.com/uploads/4473947/normal_5fdd9b942f830.pdf
    • https://cdn-cms.f-static.net/uploads/4495395/normal_6019212fc17f0.pdf
    • https://mukojemugasab.weebly.com/uploads/1/3/5/3/135314074/gugedasodeguk_zididabigez_nizawop.pdf
    • https://wixuwube.weebly.com/uploads/1/3/5/3/135303950/6bbf3da50b05.pdf
    • https://cdn-cms.f-static.net/uploads/4494673/normal_6064a48503a1c.pdf
    • https://boleturem.weebly.com/uploads/1/3/4/3/134398498/lubilufog.pdf
    • https://cdn-cms.f-static.net/uploads/4468255/normal_60130ee733e4d.pdf
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/3291496.pdf
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/125458.pdf
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/jibadabujotalaman.pdf
    • https://cdn-cms.f-static.net/uploads/4489587/normal_6014c89d86695.pdf
    • https://cdn-cms.f-static.net/uploads/4466364/normal_606ca7fcd78ad.pdf
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/7925073.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zegugas.pbworks.com/w/file/fetch/144411402/98489508918.pdf
    • http://vananizi.pbworks.com/w/file/fetch/144504774/what_ford_vin_numbers_mean.pdf
    • http://kokoxudalux.pbworks.com/f/34331606779.pdf
    • http://poxanoralanu.pbworks.com/f/86341846942.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_off0000db59.bin
0f61adfa22debe4e434bf11a682d0ca102179cb65a2101ec95c659b48e0a2857		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 5344 bytes
font_01_sfnt_off0000eda2.bin
91722aef7c52e163ef79fbe724ac2bb3e2b7c8fa4101fb9d1acf32a81fd927ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 13048 bytes

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