Malicious PDF — malware analysis report

Static analysis result for SHA-256 1695bc3a70c63e09…

MALICIOUS

PDF

70.5 KB Created: 2020-11-19 01:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7b31ba4630eca7b2644f995768c415f0 SHA-1: ee360fa21aa00de601faed9159c7aa6f01cd6073 SHA-256: 1695bc3a70c63e09d29ca3210e4f59070f47fb2c8481a6386e5e318174182d35
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 to other PDFs, suggesting a link farm for SEO manipulation or phishing. The primary malicious URL identified is traffset.ru, which is likely used to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • 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://traffset.ru/123?utm_term=grand+prix+story+upgrade+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374198/normal_5f8e942049092.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/negirulupil.pdfIn PDF document text
    • https://linezeludamaxen.weebly.com/uploads/1/3/4/3/134340908/2430949.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/7c5ab0ae-c460-42ec-b871-54cbbf71309a/wugupibo.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/watin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/061e8f5e-9cc9-4fc8-8dbd-f51691de8176/caffe_dvita_mocha_cappuccino_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b02a3ba0-6735-455c-aaae-51f60dabbdb0/23881554325.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/loradujidawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/534bab5e-4129-4847-80f0-57c55be8e1b9/tunoduvema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a69ff05-ea4a-4d0c-a44e-db98a41eb1ee/capcom_taisen_fan_disc.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/lego_dimensions_achievement_guide.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_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 5296 bytes
SHA-256: 6b262a3b16e437881b3296c1be4a5566957135468df14ce3cb3c6269baabbc13
font_01_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 10916 bytes
SHA-256: 35851eaf98d96ba261a44c035c7cf8f32274ed8a729282712407a66a710f9070

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