Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a6beddefc5b423…

MALICIOUS

PDF

68.2 KB Created: 2020-12-15 22:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9b7b6c9c97f212d437226b0b7460eb34 SHA-1: 8bc77eb6272c3aeaaa0171cc53e31ef5946d8310 SHA-256: c1a6beddefc5b423d147912037563b31eefe2f24159598508d761d5b6bebc7e3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing numerous external links. The ML classifier and ClamAV also identified it as malicious. The primary IOC is a suspicious URL that appears to be part of a link farm, potentially leading to phishing or malware distribution. No scripts were extracted, but the presence of a link farm suggests an attempt to direct users to malicious content.

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/strik?utm_term=torque+detail+mirror+shine+walmart PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460723/normal_5fc991535ccee.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/zosotobafakexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_5f9584ffe3093.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/sidaredidemu.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/c5750e1c-3fab-40de-b46a-687fb61cacd9/kizosunikari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3dd54a-f67e-4792-a9d9-9fb0652cfbaa/87842453843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f5c05e6-e0ec-4b2d-a288-8925fa41d899/plantronics_c054_pairing_2_headsets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928a1198-6882-48c6-9493-6d2c459154d2/kik_friend_finder_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e936b8-09f8-41c1-ae80-af4998b54214/70990127692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4899b4d8-3b14-4357-9882-f9404e4d52b6/93515034308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc8fc5f9-5c27-40ec-bc2a-1749d6f946e1/tomelofimadukifapege.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/22035151851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6b678d-ff17-4bd4-9c50-ea2b601f6bbc/42365399337.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB625 5232 bytes
SHA-256: a4a16e7ff2dd8452bf06dfdd86d389f47f66e8d753101cc241866e9fdba57aa5
font_01_sfnt_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 11576 bytes
SHA-256: a9d2448906f734f820543f8aa0364894c051a3d58fd9d266f302b9ef7676fe35
font_02_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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