Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecf3708efe12ebb…

MALICIOUS

PDF

67.2 KB Created: 2020-11-18 03:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26029bae096ba1dc6c0342bd3b03907a SHA-1: 11da0437f013d4cdcef8f4f911f3c4ec16b09349 SHA-256: 5ecf3708efe12ebb90af4eee7f77049b3838aaf5a6ffdb593f7ca7533c6a8882
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating malicious intent. It contains numerous external links, with one prominent URL pointing to 'traffine.ru'. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or malicious redirection attempt.

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=brooks+fiber+communications+of+connecticut+inc-ct
    • https://cdn-cms.f-static.net/uploads/4412570/normal_5faf6b1aa47e2.pdf
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/vakezo_kifakavusinu_sodowubifuxu_vekawe.pdf
    • https://bujupejokoluga.weebly.com/uploads/1/3/4/5/134576849/2ddf93fd2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7e2f20f7-a3ee-4597-a231-8eccf6845bc7/wawafugofavapiwusurevoraf.pdf
    • https://uploads.strikinglycdn.com/files/b025a187-6949-4948-8bc1-1ef473017410/rabobokirobuxozig.pdf
    • https://uploads.strikinglycdn.com/files/63ef9c91-c5a1-4b96-bed3-9238119461e2/57886562200.pdf
    • https://s3.amazonaws.com/sukedil/history_of_compton_california.pdf
    • https://uploads.strikinglycdn.com/files/a7aa04b6-ce23-4596-bf91-fa4cfaf15841/zofegukezusade.pdf
    • https://uploads.strikinglycdn.com/files/c9dc0649-c008-4881-bdf1-f2c2de7a2ea1/46263627333.pdf
    • https://uploads.strikinglycdn.com/files/d88180c1-2138-4ea7-a160-201d96e7164c/73117077056.pdf
    • https://s3.amazonaws.com/rodiligarexo/beethoven_piano_symphony_5_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/ce452efa-8733-43e6-a44f-fbd454cfdc20/kakenexa.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_off0000c9f8.bin
01f53acaf2e65fc140da7dcf126e9897ac24580e6fc6d5976259d557df5c3180
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F8 5280 bytes
font_01_sfnt_off0000dbe5.bin
a7b5091da474958df191f0a814082accb8a76659554c50013dfb5f60b27a53e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 10356 bytes