Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1b29bd260c9682…

MALICIOUS

PDF

66.4 KB Created: 2020-11-23 12:30:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b169dde8c8ca78295605b77c39130cae SHA-1: 56035536df84946250885a88670ee1f43721a772 SHA-256: fa1b29bd260c9682893d2c8b40b93055d8fd21b349278405a73162d62ed5960a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many of which are SEO-optimized PDF documents, suggesting a link farm or phishing attempt. One of the embedded URIs points to 'trafffe.ru', which is suspicious. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=amiga+emulator+android+tv
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/eff552bf.pdf
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/9806274.pdf
    • https://cdn-cms.f-static.net/uploads/4389792/normal_5fb25d7f278bc.pdf
    • https://cdn-cms.f-static.net/uploads/4408184/normal_5f922e827c026.pdf
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f8771f888484.pdf
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/2407cc4479d6a.pdf
    • https://cdn-cms.f-static.net/uploads/4428335/normal_5faa2b673c46f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pubopelej/emotional_intelligence_2._0_book_study_guide.pdf
    • https://s3.amazonaws.com/memexelu/multivariate_statistics_lecture_notes.pdf
    • https://uploads.strikinglycdn.com/files/d46866fe-920c-4aa2-b65f-62942aed45db/89902701518.pdf
    • https://s3.amazonaws.com/nisoxow/fire_emblem_the_sacred_stones_randomizer.pdf
    • https://s3.amazonaws.com/bomifabipi/94561061574.pdf
    • https://uploads.strikinglycdn.com/files/27510135-2eae-483b-ab34-115c66b3b5df/how_the_grinch_stole_christmas_scrip.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c792.bin
882774cf616599e4d6e50cdc784335bc84fdea9b211410d572ef30f5c35ef05d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC792 5016 bytes
font_01_sfnt_off0000d88b.bin
5cabed903e8fc5dcc1a2a905a1bc17632d3b667a1c27a2b5de486e047393cdf2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 10668 bytes