Malicious PDF — malware analysis report

Static analysis result for SHA-256 f808c78a6aba4955…

MALICIOUS

PDF

74.1 KB Created: 2021-01-01 10:01:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11016b7ab35aab646a282a352921b9a5 SHA-1: 19b7e80bb11e19f3cbf45f99f37fe3d3ccad0c6e SHA-256: f808c78a6aba4955892a81797cc128578db8ab9cc5b3ebd4f45e647247913325
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to direct users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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://traffnew.ru/123?utm_term=silkie+guinea+pig+life+span
    • https://bobejezesolaz.weebly.com/uploads/1/3/4/6/134622741/1893385.pdf
    • https://cdn-cms.f-static.net/uploads/4476282/normal_5fe99d4bc6a8c.pdf
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f8759fc00d6c.pdf
    • https://cdn.sqhk.co/jumupebuvi/hfrWyhj/flixplay_movie_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5fa4bcd82b758.pdf
    • https://cdn-cms.f-static.net/uploads/4419640/normal_5f96e9a59bdd0.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/zikarab.pdf
    • https://static.s123-cdn-static.com/uploads/4367964/normal_5fc93d83dc88a.pdf
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5fcd896dcbd87.pdf
    • https://cdn-cms.f-static.net/uploads/4408995/normal_5fa9c8ecc7024.pdf
    • https://bevufifebuseve.weebly.com/uploads/1/3/1/8/131855995/gufajageniso.pdf
    • https://mulodunewumil.weebly.com/uploads/1/3/4/3/134314444/98539f0.pdf
    • https://cdn.sqhk.co/ludozenidi/UYySKhg/amazon_fire_stick_remote_not_working_properly.pdf
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fdd3e978758e.pdf
    • https://static.s123-cdn-static.com/uploads/4421770/normal_5fe3dc70ec227.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3c2376d9-bf59-4cc8-a374-ad7e7c189940/8930235727.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_off0000d7e9.bin
42ddccc85cda13196bfb9567d2e592a2db60d4fa05906b80ab14bee1f9b99873		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 4832 bytes
font_01_sfnt_off0000e868.bin
807733927d0999b0b27bac61b90ba9a2d448c18ed1a23e4befefffe664095e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 10440 bytes
font_02_sfnt_off00010c1b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 4324 bytes

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