Malicious PDF — malware analysis report

Static analysis result for SHA-256 7657684977153b98…

MALICIOUS

PDF

77.9 KB Created: 2020-11-16 13:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8a2318585b63a86311028035e4f15715 SHA-1: 2cd253fd98f7800fccb3aa13c1b14ffb6c7e7274 SHA-256: 7657684977153b986885c97853796bd94a51d661f0e4a0595f91883e95157354
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous external URLs, including a primary redirect to 'trafffe.ru', suggesting an attempt to direct users to malicious sites. The PDF structure and embedded links are consistent with SEO poisoning or phishing tactics designed to generate traffic or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=dinamica+de+autoconocimiento%25C2%25BF+quien PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465688/normal_5fad4a0f26b1c.pdfIn PDF document text
    • https://ligexomapaku.weebly.com/uploads/1/3/4/3/134321337/gevofiputib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5f8875bdccb86.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/kelozom.pdfIn PDF document text
    • https://xelefivaj.weebly.com/uploads/1/3/4/2/134234850/7191f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fa0f0b8d0b7a.pdfIn PDF document text
    • https://ruxuxosiforedop.weebly.com/uploads/1/3/4/4/134491380/gewido_bejezopazodove_defaravug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_5faf51f6d88ea.pdfIn PDF document text
    • https://jiwozipepogi.weebly.com/uploads/1/3/4/4/134462700/gemejexela-veran-xikotix-luzuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403415/normal_5fa8e19952475.pdfIn PDF document text
    • https://ratomewupevo.weebly.com/uploads/1/3/4/2/134234569/33f60a9a91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487187/normal_5fad3f11b7855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f9bb7eccac35.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/mokixetat/gopro_hero_2018_gps.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/pupozug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a381661a-d351-44f6-ab4d-98172136d054/digital_fundamentals_floyd_free_download.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_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 5040 bytes
SHA-256: 0c0d09e503a25f2cb5c93f5eef28aaccecb2bec206a9630fc4e6fbd36eb35d6b
font_01_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 11984 bytes
SHA-256: ebcd32ebc9f441e00345a7e97d9bfc9225a1b8fbeb05b390bdca9b137fc2a57a
font_02_sfnt_off000112e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E7 16124 bytes
SHA-256: 40b5f26e1959d0a2ce43642815bfae51ec3e87fcb2835eb2faa9a7e82ba28228