Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44cf904b6808b2d…

MALICIOUS

PDF

70.1 KB Created: 2020-11-22 14:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9aead6b6e93cdaab2fe610093b02a93a SHA-1: 11e2a23948d8bdf0b9d664177f24fc77086a9292 SHA-256: a44cf904b6808b2dacbcc34052cf70f2ba36a6a02f89b2a2a0000e147321cc64
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded URLs and the overall structure suggest this document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=civ+5+science+guide
    • https://cdn-cms.f-static.net/uploads/4494140/normal_5fadcd32db997.pdf
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f93a06f92678.pdf
    • https://zirodaxe.weebly.com/uploads/1/3/4/6/134611642/7386109.pdf
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5f8cee676bd00.pdf
    • https://cdn-cms.f-static.net/uploads/4418401/normal_5fa39ee342c8f.pdf
    • https://cdn-cms.f-static.net/uploads/4454286/normal_5fa4f02993d5c.pdf
    • https://cdn-cms.f-static.net/uploads/4406785/normal_5fa17a431a146.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wixamupelinere/caracteristicas_de_autoestima_baja.pdf
    • https://uploads.strikinglycdn.com/files/9685f588-d781-4ff1-a0b1-8cc2c8b63e98/87423018391.pdf
    • https://uploads.strikinglycdn.com/files/e7201fa3-b6fd-422c-b31c-f0cd6024a292/burrito_bison_launcha_libre_hacked_online.pdf
    • https://uploads.strikinglycdn.com/files/18b81bb8-19d4-4f4e-95e2-3097c8e81b4d/wumawafosodaxuritovota.pdf
    • https://uploads.strikinglycdn.com/files/48685ff8-7a79-43c6-a3b1-13ac8c456352/f_table_0.005.pdf
    • https://uploads.strikinglycdn.com/files/c0409249-4fcb-4382-b675-07346f044f6a/keduxufemobidovo.pdf
    • https://uploads.strikinglycdn.com/files/a04a401c-5f4d-4b2d-85a8-476db500580e/comedy_movies_torrent_download.pdf
    • https://uploads.strikinglycdn.com/files/9fcddade-ac19-48cb-8985-b71c96afdbb8/jeforilijig.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_off0000d63a.bin
efb8f0d7c868a66bfaa83e6a09161e474bd1a32a7453a486856eaa94c2a69b8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 4856 bytes
font_01_sfnt_off0000e6e4.bin
83ae26094446dd4aeb5f6ce621d2a63d8165a4e8d2760dc4f291705cc0f36640
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 10884 bytes