Malicious PDF — malware analysis report

Static analysis result for SHA-256 812115f4a9591b26…

MALICIOUS

PDF

77.2 KB Created: 2020-11-20 17:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 832f2c0feb0a2747a0de754e96bb2bb6 SHA-1: 797c3318a47da4c1dc319f44877234ec55a41d48 SHA-256: 812115f4a9591b2697c58745fef51bc4693a363c57d2d7dab25ea0e273304b72
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious, containing numerous external links. One of these links, `https://trafftec.ru/123?utm_term=creme+brulee+pie`, is identified as a potential phishing or malware distribution point. The PDF structure and embedded links suggest an attempt to direct users to external, potentially 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-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://trafftec.ru/123?utm_term=creme+brulee+pie
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/visokumevu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8ffd6cc6-377d-49e7-97cc-2f4730fb383d/constitution_facts_crossword_puzzle_answers.pdf
    • https://s3.amazonaws.com/mexavofezoxi/wurevovulizimazemib.pdf
    • https://s3.amazonaws.com/pujinit/shimpo_pottery_wheel_vl_whisper.pdf
    • https://uploads.strikinglycdn.com/files/c6523934-f386-4881-8052-d7e6965e3bf1/82476248053.pdf
    • https://s3.amazonaws.com/turip/printable_halloween_worksheets_for_middle_school.pdf
    • https://s3.amazonaws.com/dogazisuze/newul.pdf
    • https://uploads.strikinglycdn.com/files/c1dbd77a-28c6-478e-b200-d00c3adbf32c/motaki.pdf
    • https://s3.amazonaws.com/pesetufavo/janakoniruwakuvovuka.pdf
    • https://uploads.strikinglycdn.com/files/c190f49c-0b8e-4167-8fb1-a6183fdaf216/56949204547.pdf
    • https://s3.amazonaws.com/tetazino/10_day_weather_report_for_houston_texas.pdf
    • https://s3.amazonaws.com/faluzotixupi/46684714688.pdf
    • https://s3.amazonaws.com/xupovobejanam/46188566956.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_off0000f268.bin
c72d0fe0133dda2d7b7ea4bfc16d4a67b143f5028c9258bf5a5e1cf8a14e1a27
pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 4624 bytes
font_01_sfnt_off00010201.bin
9a03fb8fb5d70c1809bc76edc67839e8aa185139f493a9342d730c43ead6e207
pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 11388 bytes