Malicious PDF — malware analysis report

Static analysis result for SHA-256 6155e77c5b131a58…

MALICIOUS

PDF

71.0 KB Created: 2020-11-20 02:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: dbbf85f57dcce894d89cdedc7b7dbf24 SHA-1: 1034c84a6dbe8fda13569645838ea761d62bb8f6 SHA-256: 6155e77c5b131a58812d31208de78fa289015b56a099fc7d0d8993e0e68e3d1d
164 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 likely part of a link farm for SEO manipulation or to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/123?utm_term=cross+country+running+terms+and+definitions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5fa7f560f3f28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_5f8a90b1520ef.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/rifunumamuw_nagemonevet_bifesoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5fad9054eb0b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_5f8ff41b16a0c.pdfIn PDF document text
    • https://bisawovetazevel.weebly.com/uploads/1/3/4/6/134613631/dizupuxizo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/720184ba-b470-446a-aa98-abc06019aa43/sonic_colors_wii_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/potevip/doripa.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/the_great_gatsby_vocabulary_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/365590c0-4798-4989-a090-ec457d9dbd3f/64723061065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/931b8243-a6b7-4a80-a80b-25f0dc2c3fce/43080645504.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/47176087647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d94eaf21-1707-4ab4-a3f3-8ab09065ce88/86251576200.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABD 5316 bytes
SHA-256: d304915673d926c10ca1dd3ed0d502629b27837b2a76cf9f00a0b95c14b272fd
font_01_sfnt_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 10480 bytes
SHA-256: fc4952fe363a5e2aaa6fe9f83f3b5d17fe7f53e23901245ed54a9473678294c4
font_02_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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