Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a74ccef13d850d…

MALICIOUS

PDF

70.2 KB Created: 2021-01-11 10:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ca1dc68e569485be79b6878e5a8fd591 SHA-1: 765ed7ae457c5660bbded7cea62c8bb807ad2e94 SHA-256: 74a74ccef13d850d3ce7f56f8147f6367bada850a4400f21b0689c15f39d5f3e
214 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, which points to a URL designed to lure users with a fake Adobe Reader download. This URL is part of a link farm, suggesting an attempt to generate traffic or distribute further malicious content. The ClamAV detection and ML classifier also strongly indicate malicious intent, likely related to phishing or malware delivery.

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://gettraff.ru/aws?utm_term=adobe+reader+8+free++for+ipad In PDF document text
    • https://dixevivoruze.weebly.com/uploads/1/3/1/4/131437918/vujebasozedadok-kitixefivufejen-semeparovoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_5fe850cbb1673.pdfIn PDF document text
    • https://cdn.sqhk.co/xogedusov/jjcdiew/85546972447.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/7F7kyDB/fotizuwegezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481993/normal_5fb42a16ce714.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/JjbfWhi/8731380494.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/betefowubevat/rijaruve.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/chadariya_jini_re_jini.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/unblocked_swords_and_sandals_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/brick_as_a_building_material.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/99916931577.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_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 5148 bytes
SHA-256: 5d39f3cfd9d7bd22680d3a41b11fa6d01169f1fa7057049d3a837b124813684f
font_01_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 10604 bytes
SHA-256: e5245acd5494c3a41e3cf1a365ee44e7f104f678e2f0fc9369ca9eebff64d6de

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