Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca6587d5cac1d9d…

MALICIOUS

PDF

73.3 KB Created: 2020-12-27 03:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 081d970dafa9d09300673d219cf958ce SHA-1: a75137c367a990ee1b3d01be2f8d13d2e8fe59d6 SHA-256: 0ca6587d5cac1d9d7ed3cfe90d203d0d86fc130f47cecedd6b794d3f7d1038be
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'chain of custody form computer forensics'. The presence of multiple external links and a critical heuristic firing for malicious redirector links indicates a phishing or malware distribution attempt. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

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://traffmen.ru/square?utm_term=sample+chain+of+custody+form+computer+forensics In PDF document text
    • https://static.s123-cdn-static.com/uploads/4471240/normal_5fe012312d388.pdfIn PDF document text
    • https://rudiduwusoxu.weebly.com/uploads/1/3/4/4/134445317/fivexuboxedap.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/gl4idDE/dujilufew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391602/normal_5fa9b770d547e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5fba6b6b6d00c.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/co6Zhcv/gifilufojufapavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475992/normal_5fada41987a68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5fa8841473b47.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/susopuzupure/basic_electronics_books.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/36931170727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea46624d-4c5f-48f6-9c9f-81690adfacc9/48942257118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d8a7d0-bbf6-4fb2-b555-92788d88bdc8/bozovasizugo.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_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 5600 bytes
SHA-256: 3ef8dce98d371a4ebf22b594024a6fb77a2d450c2dafb813cfd2bb68181309d7
font_01_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 10392 bytes
SHA-256: bb9cc241d0e71340d1f207790f81303e4d2389a7a87039499de13702b4ec6f24

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