Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed4f4af8832f857…

MALICIOUS

PDF

67.3 KB Created: 2020-12-21 19:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a148eea23d839b3d687ef0a471772673 SHA-1: d1d9c95f0fc534a985901aaa6e04dfae8a689624 SHA-256: aed4f4af8832f857f74d369e456366244e9d844c1cea3536c9b108164df505cf
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains numerous links, including one pointing to a known malicious redirector. It also exhibits characteristics of a PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/strik?utm_term=gps+speedometer+for+sale
    • https://static.s123-cdn-static.com/uploads/4378607/normal_5fc623a2d0499.pdf
    • https://cdn-cms.f-static.net/uploads/4449627/normal_5fd68e3f63db2.pdf
    • https://jezulusawuse.weebly.com/uploads/1/3/4/0/134000263/navuto.pdf
    • https://cdn-cms.f-static.net/uploads/4447270/normal_5fa4684e0a9b3.pdf
    • https://static.s123-cdn-static.com/uploads/4447278/normal_5fc5fd2e462dc.pdf
    • https://static.s123-cdn-static.com/uploads/4366017/normal_5fc54d4abf008.pdf
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5fd8b20cc8d95.pdf
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/5720540.pdf
    • https://radelemetiwiwi.weebly.com/uploads/1/3/4/5/134520029/fixuv.pdf
    • https://borobufa.weebly.com/uploads/1/3/1/4/131406827/kofiwepum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/39e15b12-b672-497b-8f48-5624bbda456a/stream_detective_pikachu_free.pdf
    • https://uploads.strikinglycdn.com/files/a7113ccf-ce88-4ad9-a25d-65f3a83d8dcf/phenderix_magic_evolved_skyrim_se.pdf
    • https://uploads.strikinglycdn.com/files/9b8a7110-6c51-4729-b12a-03dab525df75/papa_louie_2_unblocked_games.pdf
    • https://s3.amazonaws.com/gofiguj/a_pensar_juego_gratis_online.pdf
    • https://s3.amazonaws.com/tesasubawalozan/30237431904.pdf
    • https://uploads.strikinglycdn.com/files/77f96015-c294-4826-a182-1e78b8b4e80c/doniwifotirotogisaguj.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_off0000c8fa.bin
f01a13d705f300f1f3e8bf420231620f8974e20a13cbaecc446e23b47266dc9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FA 5220 bytes
font_01_sfnt_off0000daa3.bin
57c1874ae586af83a4df44f649c0f40a2cb487aef3ec7fd22b6fd566074870e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 11368 bytes

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