Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac759517519ff2f…

MALICIOUS

PDF

73.2 KB Created: 2021-01-08 08:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8ef5f5081bc2fc454c887cba1bf6bb68 SHA-1: dd877968c2bdfa627688e48b7d121bc6a8aa8fde SHA-256: 9ac759517519ff2fbda9b2f0d231bb9871e498c5ca8f300df4dd9805f81beaf0
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, flagged as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary URLs, 'https://trafftec.ru/123?utm_term=negocios+internacionales+definicion+autores', appears to be part of this link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=negocios+internacionales+definicion+autores PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387033/normal_5fb384e2c85a0.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/DgiiShj/69442067115.pdfIn PDF document text
    • https://tovexalo.weebly.com/uploads/1/3/5/3/135348509/wivodedeviloli-fitef-wodemanoxekaf.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/ePs1jea/70581849442.pdfIn PDF document text
    • https://dujejasafat.weebly.com/uploads/1/3/0/7/130739214/kusupanuxozo.pdfIn PDF document text
    • https://koludoselutak.weebly.com/uploads/1/3/4/8/134893798/5317def7461c0f7.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/hehdGTg/movies_by_flixster_with_rotten_tomatoes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/povodijirig/maplestory_priest_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/pdf_to_word_edit_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/studio_ghibli_cello_collection_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/41341000429.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_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 5160 bytes
SHA-256: afa4d457766c7538eaf6c4b97b6ecf306f6b3d611e2534a0fe35d1c04008db1b
font_01_sfnt_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 11612 bytes
SHA-256: fc2b61f6c0c2cc29ebfe00b7a276e66620ab80aa424bbe322fd1ba46a4f8e9dc

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