Malicious PDF — malware analysis report

Static analysis result for SHA-256 607e1b441169f8f2…

MALICIOUS

PDF

74.6 KB Created: 2021-03-23 09:33:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e9958ab0824dd71b3d7e1b934a256d7 SHA-1: 915b09cbed21d5ba713fc5a1463348fbabaf77ed SHA-256: 607e1b441169f8f2dffdf54aa8acb31f728b821e25b461995a2a2241eb372f80
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded external links, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document activity, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://golowaki.ru/123?utm_term=open+angle+glaucoma+treatment+guidelines
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5ff1f0dbf32bd.pdf
    • https://cdn-cms.f-static.net/uploads/4474445/normal_60138bfe6381a.pdf
    • https://static.s123-cdn-static.com/uploads/4529893/normal_5feeeb7a96743.pdf
    • https://static.s123-cdn-static.com/uploads/4444369/normal_60002beac6d23.pdf
    • https://cdn-cms.f-static.net/uploads/4373776/normal_605253586c33e.pdf
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/7159654.pdf
    • https://cdn-cms.f-static.net/uploads/4402262/normal_5fd27af21904a.pdf
    • https://zogeliwev.weebly.com/uploads/1/3/4/3/134353139/pominolepososil.pdf
    • https://cdn-cms.f-static.net/uploads/4387811/normal_6051146bd47e5.pdf
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/db8bd4ed1f05.pdf
    • https://static.s123-cdn-static.com/uploads/4426954/normal_5fdfda1854afe.pdf
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5fdbcb443d0f7.pdf
    • https://static.s123-cdn-static.com/uploads/4495059/normal_5fcd3c6a16774.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_28cb7159b77d41f9a76650ca198bbf08.pdf?index=true
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_afb92e48889f4732a6607fd5b3619a7b.pdf?index=true
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_fee871ae47c64c6481f392c72ad4e69c.pdf?index=true
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_cdfd24cadb0e4f0e93b240b9972b5a21.pdf?index=true
    • 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_off0000e74a.bin
e1ef65ee8a59b5394a9991373058d734f5db6d5596dac318d32af8e5879d394f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 5420 bytes
font_01_sfnt_off0000f9a1.bin
ba3651876ca6b137d0a9db495c6e05570bdca756f06033078adb5f8a09272895		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 10460 bytes

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