Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f11cc77b0fe4c3…

MALICIOUS

PDF

61.7 KB Created: 2020-11-11 10:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0528992b0710795efc399cc8a2b21a77 SHA-1: 764cb629e2c0039c2da826d2c264ac818ef81810 SHA-256: 41f11cc77b0fe4c36cc9730be1792b90e8af1b747fed08f8129d3296c3afb71c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to other PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://traffset.ru/123?keyword=ella+era+bonita+cap+11+en+espanol', is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffset.ru/123?keyword=ella+era+bonita+cap+11+en+espanol
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/0312ad.pdf
    • https://zixamagexiwu.weebly.com/uploads/1/3/4/0/134012381/maxakijeweva_texip_pusafekojirer.pdf
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/0b2453e65eb4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tometubufimopim/48149204787.pdf
    • https://s3.amazonaws.com/fejififimaketo/76469246639.pdf
    • https://s3.amazonaws.com/tesotiwapax/56075578290.pdf
    • https://uploads.strikinglycdn.com/files/bb7a65bb-f4f3-4009-be1d-a8434fb62465/southside_cafe_slidell_la_70458.pdf
    • https://s3.amazonaws.com/zuxadol/pelonis_digital_fan_forced_heater_manual.pdf
    • https://s3.amazonaws.com/saxefi/eric_church_tour_2019_ticketmaster.pdf
    • https://uploads.strikinglycdn.com/files/ab844a63-8ab0-47e8-aa6f-f36cad1ac84d/juwapurutiwotewuti.pdf
    • https://uploads.strikinglycdn.com/files/607e87f9-b1ca-4aef-9679-8c589b3d5db3/4227822442.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_off0000a855.bin
e29a273624348a144d59464198655599282a152d3c884fc3373782af75750732
pdf-font-stream PDF embedded font (sfnt) at offset 0xA855 4864 bytes
font_01_sfnt_off0000b8e1.bin
0edf6b093b3ce691e170e9aade412ac448fada39867012b0aa0a46e992ef229f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E1 10180 bytes
font_02_sfnt_off0000da93.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 4324 bytes