Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e3da5f4d9b5f76…

MALICIOUS

PDF

71.2 KB Created: 2020-12-26 19:50:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35776d1fe3a6a971c3fd7841cb6488ad SHA-1: b823166826238c0e95c17bf8e1c3f40ef73c35a5 SHA-256: 92e3da5f4d9b5f76ebcaf1b0140a0165e4b1aed02f29b39b2dbe1952f7821cc3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links, 'https://trafffe.ru/strik?utm_term=tanks+bar+and+grill+wayne+avenue', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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=tanks+bar+and+grill+wayne+avenue
    • https://jedudelovaki.weebly.com/uploads/1/3/4/7/134731231/gawurofodumupisozus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wilugugo/voropijujimawabofirewe.pdf
    • https://s3.amazonaws.com/vuterijoze/8251724277.pdf
    • https://uploads.strikinglycdn.com/files/fcac82dc-d6b9-4200-994a-cc835f0da8c6/pakodatego.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/13195642640.pdf
    • https://uploads.strikinglycdn.com/files/e98fc377-07db-442c-a68b-597128cb7344/ariston_washer_manuel.pdf
    • https://s3.amazonaws.com/tokafanawa/debekexisuxiluravanenod.pdf
    • https://s3.amazonaws.com/zikeko/36351284458.pdf
    • https://uploads.strikinglycdn.com/files/76995df2-a166-409d-9bc8-d4b8ff0c5243/star_wars_pantoran_accent.pdf
    • https://s3.amazonaws.com/saziwijaxodav/brimstone_missile.pdf
    • https://uploads.strikinglycdn.com/files/3345a057-7b77-4954-a954-326089cc921d/water_park_project_part_1_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa5.bin
fb42d6be438791807e2cea166ad3ec001693040ab4470f587609992e0830515d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 5092 bytes
font_01_sfnt_off0000dc07.bin
d5b1af8c0654e804f458acd4f5e05d1f3c019558ab534a7bded3b633a4390936
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 11316 bytes
font_02_sfnt_off00010261.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 4324 bytes