Malicious PDF — malware analysis report

Static analysis result for SHA-256 92de2e1fc4263b89…

MALICIOUS

PDF

73.5 KB Created: 2021-03-12 11:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f9fea59e3ed32c83425b29d1400b5f4 SHA-1: b60957967b902c6acd0f1e67ddc1bec076763066 SHA-256: 92de2e1fc4263b89ee752fb3958cd4de03167daa4e6b78d3cef82e86f394475d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs point towards a malicious distribution or SEO manipulation scheme, potentially leveraging embedded JavaScript for malicious actions.

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://nipisod.ru/award?keyword=bl+theraja+electrical+technology+vol+3+pdf
    • https://medisavepa.weebly.com/uploads/1/3/0/8/130815026/1437754.pdf
    • https://cdn-cms.f-static.net/uploads/4444647/normal_6043ec6f40197.pdf
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5fd6e118183e8.pdf
    • https://cdn-cms.f-static.net/uploads/4451762/normal_604b01d294abc.pdf
    • https://static.s123-cdn-static.com/uploads/4415530/normal_5ff2a0ccded31.pdf
    • https://cdn-cms.f-static.net/uploads/4370540/normal_601aeb2835bc2.pdf
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/5012383.pdf
    • https://tazidafojunuxu.weebly.com/uploads/1/3/3/9/133997245/lenikuzewel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sedowedi/18784986378.pdf
    • https://uploads.strikinglycdn.com/files/fc9dd2ff-2c82-4d8a-bffa-f69331b87754/96753633546.pdf
    • https://uploads.strikinglycdn.com/files/8eb3ca57-9334-46ed-8431-d8632f5b5adf/47566795095.pdf
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_e04fc591417e4f5f87d299823bc288c8.pdf?index=true
    • https://229013d5-0e14-4531-be8c-43df84542e77.filesusr.com/ugd/e4a895_0bfa95e1b94545ce9470cb7a540db647.pdf?index=true
    • https://uploads.strikinglycdn.com/files/82c4e24d-962d-438f-a792-d8a30f8cdad6/indian_government_act_1935_slideshare.pdf
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_70d290f5584847bea83473c93eedb099.pdf?index=true
    • https://s3.amazonaws.com/pusori/49026137684.pdf
    • https://s3.amazonaws.com/zarelusipofox/fenatarezevut.pdf
    • https://uploads.strikinglycdn.com/files/9ada9c6a-2c20-44be-a9f6-7bb39b8a87a6/78342809080.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_off0000e1b3.bin
901e9f2a1afeacbd1360d68093f86b7e1fc1fd3af29456eea94f589913889a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 5688 bytes
font_01_sfnt_off0000f529.bin
fb224a858c4f484253af0b58ac18f51dabc8e5bcfbfc95df86f5e305e110576d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 10312 bytes

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