Malicious PDF — malware analysis report

Static analysis result for SHA-256 b877fa184c37fccf…

MALICIOUS

PDF

81.3 KB Created: 2020-11-13 22:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 773368bd4ae401186a6e2a60d48c0133 SHA-1: b9d9b9d69769b0ac4ee366eb04bd80e7edc2a2a5 SHA-256: b877fa184c37fccf0887c9ecaee6c2ce7040344e4d76cfa22fd6c2e6019d22a6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the primary one leading to 'trafftec.ru', suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to potentially malicious sites, likely as part of a phishing campaign.

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://trafftec.ru/strik?utm_term=extratorrents+hollywood+movies+in+hindi
    • https://kopadababipa.weebly.com/uploads/1/3/4/5/134502609/fb1e51da.pdf
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f930944d4b53.pdf
    • https://cdn-cms.f-static.net/uploads/4411691/normal_5fa021576ff22.pdf
    • https://cdn-cms.f-static.net/uploads/4469351/normal_5fa5aa45d9825.pdf
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5fa2cb9fef5c8.pdf
    • https://cdn-cms.f-static.net/uploads/4389586/normal_5f98e6bc95d0c.pdf
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5f8b6c1a84ed2.pdf
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5fab03ae1112a.pdf
    • https://cdn-cms.f-static.net/uploads/4424328/normal_5faa765d2890b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/15438dec-c733-43c7-8688-b8e6cf51cf52/gapamupudud.pdf
    • https://s3.amazonaws.com/netinuwa/53633513467.pdf
    • https://uploads.strikinglycdn.com/files/0bd9ec85-429c-4973-a046-52b7d3c4a5a9/83207384619.pdf
    • https://uploads.strikinglycdn.com/files/d7ecd1ee-8b39-44c0-8940-61a1dd18fd1c/22348355443.pdf
    • https://uploads.strikinglycdn.com/files/3d5286bf-c203-40df-849a-d67896006053/jisuwujejup.pdf
    • https://uploads.strikinglycdn.com/files/3614ced5-d33a-49f7-a1f8-7ae7641e3b9e/gexewaresoru.pdf
    • https://s3.amazonaws.com/suxiweke/1999_bmw_528i_for_sale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fa.bin
21f5c7b737b78e1ee1bb58b74f09759d445ede9baae2acd57872d163517bdeb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 3076 bytes
font_01_sfnt_off0000ff04.bin
b6054a062f813fe65fe895cdee35c9d323edddd670585930ef5702c77dbec51e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 5344 bytes
font_02_sfnt_off00011121.bin
b4abe34b989b8304a9899a64e0f56c7e66cfbb031f6c378c8bffaa2cf9a89ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 11416 bytes

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