Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4361474fae77871…

MALICIOUS

PDF

63.8 KB Created: 2020-12-30 03:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4d32df0c3912923af71ef55680175e17 SHA-1: 91ef8c1892c73fc1a4900a3b6970db25d1b57668 SHA-256: e4361474fae77871cea1205ed5ce210ce70e0e7d86e7595a097e5bd6a8120009
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 dynamically generated, suggesting a link farm or SEO poisoning attempt. One of the primary URLs, 'trafffe.ru/strik', is flagged as suspicious and likely leads to a phishing or malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/strik?utm_term=smash+repairs+kingston+tas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5f980dad85b58.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/O9egeCU/30051282862.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/zuguwadab_diredofajo_sobijemu_gagefefotovar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464077/normal_5fa21e046afd9.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/6131780.pdfIn PDF document text
    • https://cdn.sqhk.co/lewuravasu/ijvicgg/vatedoroxizege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413980/normal_5fc6dce64534f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_5faa8885efe7c.pdfIn PDF document text
    • https://cdn.sqhk.co/gifexajed/PdjfjeU/vililojewibiwumaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_5fd1d0d39affa.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/5ec4a8a6-74d1-4134-89d7-eff4752f1dcd/femawelonerowevezijufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7635219-1913-4fc0-8f29-83a083660d8f/centerpoint_3_9x32.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f00796-ec53-435a-ae4f-af29a2a7b300/watch_warrior_online_free_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/568238a9-8234-4754-b4f9-53776a971e78/offroad_outlaws_cheats_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/ralenibipodoxiveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ccca79b-8138-4e80-9101-bd8a02d7cb74/95406722744.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_off0000be05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE05 5368 bytes
SHA-256: d29cce3007c6969da8144bee274e45e8e78540248723b19ba19fccdb63b3585a
font_01_sfnt_off0000d01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01A 10052 bytes
SHA-256: 01de94916e6818902c4de2e19bc370f9a1437ebc461c65426599c68876399467

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