Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f935e7c776ad04…

MALICIOUS

PDF

67.0 KB Created: 2021-01-05 04:49:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3bc05d5386b09ac607bf0183af3510d6 SHA-1: 731384bf4493bd05874e5b6773a9aaccca729328 SHA-256: 36f935e7c776ad0401cc17686fb438fadca66a1122b3e2b09a1b39a60c509d18
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to link farms and a known malicious redirector. Heuristics indicate it's a malicious redirector and part of a link farm, with ML classification strongly supporting maliciousness. ClamAV also detected it as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://gettraff.ru/123?utm_term=tangerine+edward+bloor+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_5fc3896bcef66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_5fba46cfb844b.pdfIn PDF document text
    • https://wogivanozo.weebly.com/uploads/1/3/4/5/134586267/931461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f8894ab3e2fb.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/jha3if9/muxowolikatuxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459914/normal_5fc44dbb1e203.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/673107b9-9c69-462e-b541-ac06ce41cf35/57604738104.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/chinook_pass_report_washington_state.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/zefenarudaxerewafi.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/17023384854.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/shows_available_for_amazon_prime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/527eca9e-61fc-4358-be17-eb51911ca9ff/4x4_battery_tie_downs.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_off0000cb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 5212 bytes
SHA-256: bfc7c4b8cc6b5ac6024a2fff4f07f572bb91fdda6fdc96e2a2da5de505a212d0
font_01_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 9968 bytes
SHA-256: 5b8f2c076b2dcc9c53463ecfdcbfbdd8da5a40aba2a0af543de94a98deb4f713

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