Malicious PDF — malware analysis report

Static analysis result for SHA-256 6047707d56d871bc…

MALICIOUS

PDF

81.8 KB Created: 2020-12-09 06:30:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 95114b2d99f53b7a5ac3d89666d12813 SHA-1: b674800299c80a0cee0c61ba0078fd72022729c1 SHA-256: 6047707d56d871bc8b7e05fcb19af9f121225b664f831cf6c161368032dd060c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/strik?utm_term=3.5+cloistered+cleric In PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/mokowivogulaxemotufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376609/normal_5f9265e97bece.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_5f88c84e8885d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452607/normal_5fc9603c5f6b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_5fd045729e130.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5ba7e0a2757459b03f866/t/5fc64e8c08845d092461754e/1606831756385/gowiregenamonorowuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ec8094-e173-4188-8d99-93cb244d8ab1/6502178778.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6fcd4d8c3650128350c97/t/5fc7ddbb2431962c2dc62e97/1606933947955/56570135608.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1748eaf37e3b6463da3b/1606293321089/free_e_gift_card_generator_verification_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc68eac104edf1d77a85ca7/t/5fccfe09260a660a6bddb94b/1607269897958/gobofusebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f3c93d-a28e-427a-9582-21c96ff32744/tafivutawisegavifurati.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 4948 bytes
SHA-256: f8157b89a66354f8a362e11ed9b474e94b1b9852699a9e8d9f46099f555ee0c5
font_01_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 10780 bytes
SHA-256: 6302600632eb9dd795278f9159a935110ca63964b3163d43cb4f56fafb6de618

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