Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c345177aab64733…

MALICIOUS

PDF

69.8 KB Created: 2020-11-18 07:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d5cddce9aa83cb057abf80473091aac3 SHA-1: c61cc6fad2e479098dfbd804fbe3d5a8e0377c9c SHA-256: 5c345177aab647335bbc33c9531a97a78f1eb04f520f8f00f6ca9b66345551d9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO spamming operation. One of the embedded URLs, 'https://trafffe.ru/123?utm_term=buffet+warming+tray', is of particular interest as it is not marked as benign. The document body contains garbled text and metadata, indicating it is not intended for human consumption but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=buffet+warming+tray PDF link annotation
    • https://damuxuru.weebly.com/uploads/1/3/4/0/134040763/latebijo.pdfIn PDF document text
    • https://lesajevix.weebly.com/uploads/1/3/4/3/134318042/jeboveg_jomuropit_dosakavoruk.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/bovudefomuleb.pdfIn PDF document text
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/3078400.pdfIn PDF document text
    • https://jugoruzaja.weebly.com/uploads/1/3/1/4/131407370/fupud.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/b6f1c328-e463-4250-b0f7-314c5ba5258e/imaginarium_55_piece_train_table_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96d0ca43-4547-4f9f-bfc0-4d98246ccb78/biwuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519b8092-c91e-4d41-937a-7ca851a0ca2a/wemanegobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea3d60c7-54ee-4ee8-8856-6366209a413e/por_siempre_tuya_acapulco_capitulo_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef572150-e9e8-410b-b837-cebedc294305/megowo.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/blackmail_video_song_bestwap.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_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 4892 bytes
SHA-256: 96edd1ecab8547011f5205e9bc20e95b626cce7fb917baf36001b6a15ef96263
font_01_sfnt_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 10120 bytes
SHA-256: 65f912106f662e925c2dc7724bd7f7233d8e00d19dc38221fb198ddf4e3dfd6c
font_02_sfnt_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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