Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f65c29b4d1e833…

MALICIOUS

PDF

74.4 KB Created: 2021-06-08 02:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f92c057b3a9387e6ae9aa1c9657cc7c SHA-1: f8cab77c1ee587b69b5130bb927098f0460a7b7d SHA-256: 92f65c29b4d1e83374954793f04884afaa4c755485cb50a19f977861ccc3fafb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or a method to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards a phishing or malware distribution scheme.

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://irlanc.ru/pbw?utm_term=secretarial+practice+11th+commerce+textbook+pdf+in+marathi
    • https://sogekapi.weebly.com/uploads/1/3/4/8/134891770/df69282bafb4af.pdf
    • https://guwiretaxuzaji.weebly.com/uploads/1/3/4/6/134687660/be29f3c.pdf
    • https://cdn-cms.f-static.net/uploads/4387929/normal_6036ad35bd3ce.pdf
    • https://rotutipugav.weebly.com/uploads/1/3/4/7/134750083/wasadot-pudufevafu-felopajedawe.pdf
    • https://zowinalonewexaf.weebly.com/uploads/1/3/4/6/134680062/kexademanojofejiz.pdf
    • https://zopokobo.weebly.com/uploads/1/3/1/3/131383813/3641533.pdf
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/kazataxeganepo.pdf
    • https://bilugiwunifi.weebly.com/uploads/1/3/1/4/131408415/9088982.pdf
    • https://paxiguvemogi.weebly.com/uploads/1/3/4/3/134317910/zirututogevoge.pdf
    • https://cdn-cms.f-static.net/uploads/4366407/normal_604ad60300a67.pdf
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5feb090472de6.pdf
    • https://wejolizamu.weebly.com/uploads/1/3/4/7/134766198/6976845.pdf
    • https://cdn-cms.f-static.net/uploads/4366007/normal_604a81e075036.pdf
    • https://ziridizozavixik.weebly.com/uploads/1/3/4/4/134400570/7699d8411.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/212e0408-fcda-4da0-98d7-f3cf0836102f/fovubarutobuda.pdf
    • https://uploads.strikinglycdn.com/files/4512d5da-dfd4-41ab-8e9a-539521041223/94994206747.pdf
    • https://uploads.strikinglycdn.com/files/cdc306ac-243d-48a2-83d5-8b55a099366f/can_druid_dual_wield.pdf
    • https://uploads.strikinglycdn.com/files/4d35c3b0-ab87-4b86-9af1-28179aef0b0b/bizemevivupazirurixup.pdf
    • https://uploads.strikinglycdn.com/files/a19edc54-0406-4838-8958-576d5ee46922/10293217158.pdf
    • https://uploads.strikinglycdn.com/files/43615974-991d-4a3c-b22e-f2122ba98c13/50548432423.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_off0000e224.bin
4722acef7bbec03ddefdc7842b4e58fb7a2559ca3fae692f961118b983b38d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 5644 bytes
font_01_sfnt_off0000f52c.bin
ee5d09fb2bc28675475c5e7d47e4bd7ee7ada890d7809784eb4655531555b901		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 10852 bytes

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