Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc51a8fd519250ad…

MALICIOUS

PDF

70.3 KB Created: 2020-11-09 21:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 678513bacbb9b54cea0942bc3c107f4d SHA-1: efa30bd423958702887fccba70f7aa0e19d8c332 SHA-256: bc51a8fd519250ad8912af47708cc9fcdd444fd115aa4e05a52a77a11a9fded2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/strik?keyword=cba+military+ball+2020'. This URL is known to be associated with malicious activity. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure users to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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?keyword=cba+military+ball+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f8918fca237c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_5fa5e2fdadd25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/panokojol/cancer_de_pancreas_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/vagigosumegebezalube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6a244c-cd05-44ba-ac15-b4be7e7ea285/19226866614.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/the_shade_of_elura_classic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/511f5234-763b-45da-828b-19c318ea6672/jalofabafozir.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/the_tale_of_despereaux_test.pdfIn PDF document text
    • https://s3.amazonaws.com/padoragog/favonivikegubuduvekoze.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/sage_300_accpac.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/9434308181.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/1654114058.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/airbrushing_for_beginners.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B9 4408 bytes
SHA-256: 41bec5b037b9e36fc33834d3751b0924745ad4f55a0bf05a705321d67f78bea4
font_01_sfnt_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 5072 bytes
SHA-256: adcc18bc5dd6b2b655fb3f75dec249cf99463b04937d637ed503c535bb684759
font_02_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 10608 bytes
SHA-256: f2b4f1bb22f6bf69e07b07f33d77b3d5a179ebbc260109ae34bd97cf5f7785ca

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