Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbd964305d020dc…

MALICIOUS

PDF

77.0 KB Created: 2021-03-14 10:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 956eb23a1bd1406b24f785bb5ac4fe8a SHA-1: 7a8d17c59af4498cf86a2659004e6eb11620cf5c SHA-256: 8bbd964305d020dcfa08b902092c4a95dd14493079749b5fbe82739c4c0882e7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a 'binary system pdf download' lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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-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://druttle.ru/award?keyword=binary+system+pdf+download
    • http://copyrighthelpbusiness.net/3176801926f52op.pdf
    • http://kleomaften.online/how_to_pass_rev_testcf9v1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_76323bf8e9cd49069cc8727a1da92ded.pdf?index=true
    • https://s3.amazonaws.com/lolijexejomak/guidelines_for_follow-_up_surveillance_colonoscopy.pdf
    • https://s3.amazonaws.com/sixolose/86252374393.pdf
    • https://uploads.strikinglycdn.com/files/58c08135-e9b3-4719-8f75-970766a81173/what_was_cains_occupation_in_the_bible.pdf
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_4fd3e0fa103a45d498d58aa8892f6828.pdf?index=true
    • https://s3.amazonaws.com/ziwuvijevo/lester_assassination_missions_money_guide.pdf
    • https://uploads.strikinglycdn.com/files/64af24d9-d860-4f01-97bf-c1e30a3117a4/ezdrummer_2_download_mac_free.pdf
    • https://uploads.strikinglycdn.com/files/c7b52dd7-5606-438d-94f4-40e72ad60e75/jixujaporote.pdf
    • https://s3.amazonaws.com/pibajuwi/xisinarojaloromabapabafut.pdf
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_f0d373451984420c9c9f5a8778346005.pdf?index=true
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_e3c158431e2c475baec645f47aa1d7c5.pdf?index=true
    • https://s3.amazonaws.com/toguvaju/fisiopatologia_da_doena_de_alzheimer.pdf
    • https://s3.amazonaws.com/gurupixabogivaz/numefosegokofiwevavofo.pdf
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_b6f5ad548a404eb796f99e261f78a8ca.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cb7618c2-1833-4bff-927b-264835f45cff/88769283376.pdf
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_40e53c595c9048a7b30a6e8e32434750.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_off0000ef40.bin
1eb74ecb42e65ed037a0386e2fcd5a94b01db3bc91cedf343c176bb10122b0a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 5432 bytes
font_01_sfnt_off000101bc.bin
83fff37c72b4701fd93e93f0463b5f38ee3c7df6ceca61983e08923da9530b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 11000 bytes

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