Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f4f4ea6750ae05…

MALICIOUS

PDF

77.8 KB Created: 2020-11-19 06:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 751e0b31061edc1f9f4a04046e9434da SHA-1: 11d859820be47056a98800f963045649a7a8de22 SHA-256: b5f4f4ea6750ae0557f9a1cbe6ccaf3decd8f3d107ad24a0525687dd4d81aeb3
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate a high likelihood of malicious intent, specifically related to link farming and phishing. The ML classifier and ClamAV detection further support the malicious verdict. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/123?utm_term=byrne+v.+boadle+full+case
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5f8e59a1c2cb0.pdf
    • https://gogafijunovox.weebly.com/uploads/1/3/4/3/134322332/visevos.pdf
    • https://cdn-cms.f-static.net/uploads/4421218/normal_5f9d15329f8ce.pdf
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5f8f324570d9c.pdf
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5f8b2f4ecd01a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1d4e04e1-353d-44f2-9d48-18d51053dd8a/44651674421.pdf
    • https://s3.amazonaws.com/kiwopusafize/38961653542.pdf
    • https://uploads.strikinglycdn.com/files/e85eb9c9-da3d-4306-ab23-e5a0c4bd33b0/dunujadukefapogeb.pdf
    • https://s3.amazonaws.com/zerejibixupav/temuka.pdf
    • https://s3.amazonaws.com/sevoga/the_jazz_harmony_book_a_course_in_adding_chords_to_melodies_david_berkman.pdf
    • https://uploads.strikinglycdn.com/files/22f4626f-ecfe-4761-aeef-9847cd21cde9/wafepo.pdf
    • https://uploads.strikinglycdn.com/files/7688d197-d09e-4e6e-97a9-02c5d897e098/65498020174.pdf
    • https://uploads.strikinglycdn.com/files/8e95a445-ff36-4200-9a15-5946ea4668b7/52668759324.pdf
    • https://uploads.strikinglycdn.com/files/a0e28902-f719-46e9-9cf9-e713abc7f483/kakegurui_season_2_episode_1.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_off0000e5a3.bin
9bfb5b9ba63de3ad874c9550734b2f291074a63f40b1d14e7465cb1b896da872		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 5152 bytes
font_01_sfnt_off0000f739.bin
26df7af8e2ad010265c2cc8fa429f46dcddbdbc6cea3a6fe5195a7844ad9796a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 11212 bytes
font_02_sfnt_off00011c06.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 4324 bytes

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