Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d489963b71434d…

MALICIOUS

PDF

96.6 KB Created: 2020-12-28 11:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2577b0c0d10a1411b14c635d18d13414 SHA-1: 9ea04794f9006ba1eafdb1bd03e408ab0a71614c SHA-256: d1d489963b71434d575ba4d6df8dc2d9c0b327c30b44e092a88489d2b4ac71e9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?utm_term=gymnastics+strength+training+near+me PDF link annotation
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/gelalol.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/cibVjeu/78051376523.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/jj4jchf/vurul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471479/normal_5fe033218f5e9.pdfIn PDF document text
    • https://ziliseze.weebly.com/uploads/1/3/4/8/134855349/26901c8ea729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f91ff758b47c.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/jajisudofuvim-genebilozutep-xuwakevijuwama.pdfIn PDF document text
    • https://cdn.sqhk.co/mozejipakas/gdgchcZ/84564601884.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/03958eb7-7bc8-48bf-9ab9-33a4c880580d/my_hero_academia_mei_hatsume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a04b7e-eeab-4464-974f-25d2ae4fbc39/fokuguf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b963fe9e-773d-4e31-9982-65a7c0987e72/wuzipesunepalosofiwemegev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16d6a95-8c42-4210-8528-1b6967261266/6799290709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f8ee080-927a-4329-a97a-8e5ca34366d7/vopuzusozudulitezo.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_off00013b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7B 5316 bytes
SHA-256: 34c72996e6f7288daa0f23b0415c52637780f38ce14a5fa41ed88a36bf8bfa30
font_01_sfnt_off00014d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6F 11396 bytes
SHA-256: 2826383f5ec4e8bcbad4d326e502812be76c6954c041ce9fa9e756339e6013b9

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