Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5876670dbfcb466…

MALICIOUS

PDF

67.0 KB Created: 2020-11-23 05:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cf3ae7aba410f2daba012fe684836f81 SHA-1: 7fd7e9a038e472d59f50e0a6355e148de4984735 SHA-256: a5876670dbfcb46696bcd5510a1cedb6a2f6ddaedc743e8564c04a61ea76e457
234 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for linking to known malicious redirector infrastructure and a high-confidence ML classification. The document contains numerous embedded links, with at least one pointing to a known malicious domain, suggesting an attempt to redirect users to harmful content. The presence of a callback lure heuristic also indicates a potential phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/aws?utm_term=sociologia+criminal+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_5f8ed6f1a9f83.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/caa393075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_5fae45262baf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_5fa501c11b722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491670/normal_5fb6ace331afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fa1b5b05dad1.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/5a5d892f-ed45-4f64-8713-cfe5dd0d9518/wow_talent_guide_druid_guardian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b31966-a100-43f0-82b8-a216cee37420/44916052791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace1d4f3-3ab1-4f5b-96ba-51ad89f93a0e/30715837481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d40c4149-5e8d-4d11-abd3-900a4496df35/zidolubof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8703357a-917c-4003-9340-bc7601f3ceb5/xitonimowijutazusut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f926e5-49f1-47ca-9f9f-59ae67001547/15480584538.pdfIn PDF document text
    • https://www.youtube.com/watch?v=rIoN6r91cuo&feature=youtu.beIn 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
    • https://www.youtube.com/watch?v=rIoN6r91cuo&feature=youtu.beIn 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_off0000c8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D0 5400 bytes
SHA-256: 122c604f5b898287a3fceefc942b6310d90a1261998e2867d7c26ab8590fa240
font_01_sfnt_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 11076 bytes
SHA-256: cb26dd341f226a46960b1ff2fcc05dbd6b8943e35b3dd35e29c75ccb0d093a58

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