Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9cdef335ecc494…

MALICIOUS

PDF

79.2 KB Created: 2021-03-25 09:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb1af2b96ebf4831c08636fdda2fe7a1 SHA-1: bbe61e4e3bf8611417507eb33e0d3b0c73ae5c7f SHA-256: ac9cdef335ecc4946609c37ab73efa9c554910796f61fa6262c7ad33c28eae9e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a phishing or link-farming attack. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links points towards directing users to potentially malicious websites, possibly for credential harvesting or further malware delivery.

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://seumenha.ru/strik?utm_term=2003+dodge+durango+shifting+problem
    • http://zaxevef.getenjoyment.net/zexovudebazagutaj.pdf
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/f07f0.pdf
    • http://vitonidero.medianewsonline.com/64934402579.pdf
    • https://vafobuzegigotot.weebly.com/uploads/1/3/0/7/130775214/2376357.pdf
    • https://cdn-cms.f-static.net/uploads/4394082/normal_5fd32897e0b3f.pdf
    • https://cdn.sqhk.co/lelogivotosu/dPgVpjj/28101047157.pdf
    • https://cdn-cms.f-static.net/uploads/4453537/normal_600e5e4e0a72e.pdf
    • https://cdn-cms.f-static.net/uploads/4369654/normal_6021a35a529db.pdf
    • https://cdn.sqhk.co/kupemopo/kR7geja/srs_close_protection.pdf
    • https://nonaxoboru.weebly.com/uploads/1/3/4/4/134467623/5248a13.pdf
    • https://cdn-cms.f-static.net/uploads/4453334/normal_600d0140a2570.pdf
    • https://cdn.sqhk.co/fedelubu/ifbjiG0/desusazobikikutuxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lulelepese/jared_kushner_peace_plan.pdf
    • https://s3.amazonaws.com/suxiweke/any_fb_video_online.pdf
    • https://s3.amazonaws.com/bejokazemur/aube_programmable_timer_instructions.pdf
    • https://s3.amazonaws.com/zurovajij/xorubinububevurenosujimaj.pdf
    • http://rofuvawitarul.atwebpages.com/81067270155.pdf
    • https://uploads.strikinglycdn.com/files/9b4e8c2d-bb2f-4409-8bac-86a56c73ecf8/koduzafifebuledulevewi.pdf
    • https://uploads.strikinglycdn.com/files/d30ea8b0-42b9-4b6e-b02f-68fb5a7f77d3/24342204492.pdf
    • https://s3.amazonaws.com/zunaporam/10399827798.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_off0000f440.bin
de437327a60ae151d1aec1ef5acc5879056552155af517f816819e4a37e31384		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 5936 bytes
font_01_sfnt_off00010848.bin
c7fb208f6c4431b327e07f02f5c6ab4546c74cdb7989be8ba188d301a85a3afa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 11404 bytes

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