Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac1d3da37182969…

MALICIOUS

PDF

67.4 KB Created: 2020-12-22 11:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 978378a6b7a9a8a61b9f118aeb1b630a SHA-1: 1574632a7c5200bff61b7e0b7fe8532369a13087 SHA-256: 1ac1d3da37182969ee7c741998c5233c889680769718023ea61c3635d3f57ecc
164 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating it's a fake invoice or payment lure, combined with a critical heuristic flagging it as a malicious PDF with a high ML score and ClamAV detection. It also contains an embedded URI pointing to a suspicious domain, likely intended to deliver a secondary payload or redirect the user to a phishing site. The presence of embedded JavaScript further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffine.ru/123?utm_term=equipment+bill+of+sale+missouri
    • https://fumevixupi.weebly.com/uploads/1/3/0/7/130775707/xukozivuvimi.pdf
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/dozipuwoluwasam.pdf
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/7974110.pdf
    • https://zunesevofulopu.weebly.com/uploads/1/3/4/3/134385883/vutet-diwaget-kumekafab-xekikidozu.pdf
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/6422721.pdf
    • https://kevonixoxudunu.weebly.com/uploads/1/3/0/7/130775897/f31f2d6fe.pdf
    • https://farenutatovepo.weebly.com/uploads/1/3/4/5/134502273/zepugirusekari.pdf
    • https://xexofukirusolim.weebly.com/uploads/1/3/4/8/134871283/xetiwewawod-rinun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jiwisi/20881436223.pdf
    • https://s3.amazonaws.com/jiwisi/gezebiwogakudakopaxavu.pdf
    • https://s3.amazonaws.com/jemazejodep/what_is_a_non_conservative_force_in_physics.pdf
    • https://uploads.strikinglycdn.com/files/d5646494-105a-4ffc-9195-44460d640258/analisis_del_poema_he_andado_muchos_caminos_de_antonio_machado.pdf
    • https://uploads.strikinglycdn.com/files/cc987e24-c370-4662-af61-82b0396d5375/emulator_for_ps1_games.pdf
    • https://uploads.strikinglycdn.com/files/f7c0024e-3bbb-4df7-a779-24af3da6b2db/gary_chaffee_time_functioning_patterns.pdf
    • https://uploads.strikinglycdn.com/files/d80166ca-42fa-49e1-921e-5b528b1b7c75/kifowikawamenamojazonuta.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_off0000cc37.bin
6285a361dcd281a3d92fcfb915cd81d1c8bad4af75535fcc7de374871410503d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC37 5268 bytes
font_01_sfnt_off0000de11.bin
2aa067ea06cce2ec79f14946bae350c4f1d527d38fc90f2bf6fa353104fa6858		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 10228 bytes

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