Malicious PDF — malware analysis report

Static analysis result for SHA-256 54557a8a7ad0df9c…

MALICIOUS

PDF

74.2 KB Created: 2021-01-06 19:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 281f66138d0a7a2ed96af6ce7621d38b SHA-1: d7d7fae86bc3f427613db025358f2ce2f742aa3e SHA-256: 54557a8a7ad0df9c57646f895afd99a14579e04b395aebdcd9b26e318561c34a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as datasheets, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/aws?utm_term=datasheet+capacitor+100uf+25v PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5f97c7d1e873b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_5fe81d48403ed.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/7cb203241fa0db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f8b1f43e8372.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/hihaejh/zigzagoon_galarian_evolve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5fd7f7aa8bdb6.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/zejolidawa-refix-temazimokip-tusavujusik.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/454724d7-f6ed-42dc-ae9c-e70df61fef7c/4046040269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27822b4-f0ac-41ad-bd57-50188b663a54/47732858158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0fb50df-615a-42c6-9d1d-f9812ae3de16/hurdle_distances_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64895e1-655e-452a-8113-d1f13300540e/22666820220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a931e971-1c9c-4631-96a7-580ca1a5b93d/35061840300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e8bb91-af63-4f83-8959-18d9bc3285b0/zatonedikejakepibif.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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 5580 bytes
SHA-256: 5fcee1b996ccde88ba74c4196e4e21e543bd102ee2890c6b0739c8177f001512
font_01_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 11972 bytes
SHA-256: 5ec5586db68fd0426b49901e0f8e34f1588dfdbb4734cb31a90203ae38bbfb44

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