Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c5b396e2ae7192…

MALICIOUS

PDF

69.3 KB Created: 2020-11-14 02:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9196debf8fe5e67c25c20bd5acebe4f SHA-1: 510c56976f1939cbe3dbca5ffe651605b980909f SHA-256: 91c5b396e2ae7192610a15eb1e8d58a9eb8c0d5f291521770eb067c699937c8f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of many external links suggests a link farm or phishing attempt, aiming to direct users to potentially harmful sites like the identified redirector.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?utm_term=the+body+electric+electromagnetism+and+the+foundation+of+life
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/banorafedesibikidure.pdf
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/diruxurom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fasanag/17383539411.pdf
    • https://uploads.strikinglycdn.com/files/e9ca05e7-d53b-40e5-b8f8-9dbfd034af03/weradogokozobagokikuvas.pdf
    • https://uploads.strikinglycdn.com/files/ca733f41-4550-449e-9364-86a40b2739e2/qa_manual_tester_resume_sample.pdf
    • https://uploads.strikinglycdn.com/files/e44f6568-2223-4246-9e39-31614731809e/super_toss_the_turtle_mod_apk_1.171.50.pdf
    • https://uploads.strikinglycdn.com/files/90b29667-b870-446e-a8ea-4060cf182179/wawesigixemonenopenak.pdf
    • https://uploads.strikinglycdn.com/files/d5a3727c-459f-49a8-8edb-8e00d70d52ff/danopo.pdf
    • https://s3.amazonaws.com/luxelula/fojuxavoguto.pdf
    • https://uploads.strikinglycdn.com/files/647107d3-ada6-417e-b8c0-e21fd76bbcc7/10651445293.pdf
    • https://uploads.strikinglycdn.com/files/349fd20f-478c-468b-b089-3cad8c3945a5/rugexi.pdf
    • https://uploads.strikinglycdn.com/files/523f719b-eb9d-45a3-96e1-7c83dddd6430/31758889997.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_off0000cfcf.bin
ee3a3207f53d237522d2f847e5cbfc86f88f54d3749ded2cb0afd431131257e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 5628 bytes
font_01_sfnt_off0000e2ca.bin
56477e9aae943b9cb4618d8e90775936e145cf766608b083d186d55d75e5ca3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 10948 bytes