Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95c9583bf33d0a4…

MALICIOUS

PDF

78.0 KB Created: 2020-11-19 09:35:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4ec95fed8f8cf87f729aada5e82dcf5c SHA-1: 1b83884fac90dd2a567fc676a265af8f7383f8a0 SHA-256: b95c9583bf33d0a48548240976bd46db4d82169cfb41c8469ac7b5ef81dffc16
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it contains a link farm with numerous external PDF links, including one pointing to 'trafffi.ru', suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=lambertville+station+inn+new+hope+pa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409123/normal_5f9814d8b41db.pdfIn PDF document text
    • https://fejovixojik.weebly.com/uploads/1/3/4/3/134333762/91562.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/987b2a33-d0ec-4711-b563-65618d07e241/gekefexafuseg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5414e862-2d7d-4f7b-994a-e143a36b6262/65251787047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86441391-6ec3-42b7-a988-b6b77d8195eb/xosifajikabuvabageladex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca20d1f-17ad-4535-9b95-bbf794ae7a83/cia_handbook_of_trickery_and_deception.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6683c342-7091-407b-aeb4-9953db574f3e/new_life_hiking_spa_killington_vt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b84a3c-e9e9-49c3-bc1c-ca817c583d44/miporekumakevofivifod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc562ec-326b-479a-bbc3-405d2f4d4177/41654118842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928f12eb-49e1-4b7f-8750-9305855e41d5/kekerowawogaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d944c9-e2a0-4507-80ca-d67a86abf229/67586234433.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5E 5080 bytes
SHA-256: a269afbf12a22ebf2251346a2e8aece2b7a985b638fae5c2cd76488603ad5c2e
font_01_sfnt_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 12772 bytes
SHA-256: 3b523ecff616f5ae1c537f198a930a3dbc7213aa82b3d303e4d9fc1c0d8b16d9
font_02_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 16068 bytes
SHA-256: 89247d3646e3773572243f1d4b0449240b5d7bcbc9865045ac28c7845acd9c8f
font_03_sfnt_off00011ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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