Malicious PDF — malware analysis report

Static analysis result for SHA-256 34966059227b06e3…

MALICIOUS

PDF

84.6 KB Created: 2021-05-25 00:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f17dee7921410cebc42ec662ecd8f6f SHA-1: ca24556f1ea2667da976887e817dd018b2470450 SHA-256: 34966059227b06e3d0754ff65e791eb9d1a04d7be9962ffe8792be544a49c86c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The primary URL, https://pelibifir.ru/strik?utm_term=what+do+taurus+match+with, is likely part of this malicious infrastructure.

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=what+do+taurus+match+with
    • https://cdn-cms.f-static.net/uploads/4374986/normal_604d92cc335a9.pdf
    • https://jivupofa.weebly.com/uploads/1/3/1/4/131406879/2248694.pdf
    • https://zefuduxob.weebly.com/uploads/1/3/4/8/134895043/mekidogomab_wejimufol.pdf
    • https://rejobasagiletez.weebly.com/uploads/1/3/4/6/134642313/6244954.pdf
    • https://cdn-cms.f-static.net/uploads/4420939/normal_602e0f1de3ca8.pdf
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5fe40134924ad.pdf
    • https://cdn-cms.f-static.net/uploads/4464542/normal_603448115bcc0.pdf
    • https://static.s123-cdn-static.com/uploads/4367019/normal_5ff52de656315.pdf
    • https://cdn-cms.f-static.net/uploads/4382201/normal_6018453694247.pdf
    • https://kibowoje.weebly.com/uploads/1/3/0/7/130775027/c5da3b08.pdf
    • https://cdn-cms.f-static.net/uploads/4501503/normal_6062e04a3f9ea.pdf
    • https://cdn-cms.f-static.net/uploads/4500877/normal_603728c05c3b7.pdf
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/gajofupexetobi_xapumoredojotul.pdf
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/f3aae714776.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/poresi/tav_prasad_savaiye_translation_in_punjabi.pdf
    • https://s3.amazonaws.com/belapawerezuju/xutegenojurelejimem.pdf
    • https://uploads.strikinglycdn.com/files/97324b8a-9354-479f-bfbc-c636b084cebd/tutaxawujisajijovapax.pdf
    • https://uploads.strikinglycdn.com/files/e2162277-d5d4-4ede-85b2-c9466d324b63/what_are_the_basic_assumptions_of_feminist_theory.pdf
    • https://uploads.strikinglycdn.com/files/9e11696c-6723-4c83-a614-582b623d7805/fagenixununixojixowu.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_off00010f3f.bin
3be055d8dc7ec84d5df8ee54209d1de3e7643f6b9a684ea522471f739d9a86ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 5252 bytes
font_01_sfnt_off00012105.bin
ad6a1b24700c41cdfb832d20b78bcb972fe745af95ede9a4d078fbb1be0edcda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 10292 bytes

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