Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c851613111079f5…

MALICIOUS

PDF

75.3 KB Created: 2020-12-29 12:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 326a73f6fcf845b96433d31769091cb3 SHA-1: ebe1e4fa74f0099a2dcbd70cac53954ae35f91d7 SHA-256: 6c851613111079f5cf1338ae9b71990fe9ce61a012afb56e4505b00925691ea6
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least two identified as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or spam distribution. The document body is heavily obfuscated and unreadable, but the presence of numerous external links points to a link farm or redirection strategy.

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/strik?utm_term=glow+worms+eat+snake
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/kalogejejesit.pdf
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/gesanubofonabakak.pdf
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/bivuj_vesusutarofa.pdf
    • https://cdn.sqhk.co/dutebevon/A1jfjj4/smash_bros_ultimate_wario_combos.pdf
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/wajoxixedo-wuxemeferup-bitufixiki.pdf
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/9330922.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rurosaveruk/15553782751.pdf
    • https://uploads.strikinglycdn.com/files/e7c156a0-06ac-457a-b1d6-aa21458fd966/mainstays_bunk_bed_assembly_instruct.pdf
    • https://uploads.strikinglycdn.com/files/28aaaa65-9973-4eda-ae73-d0f56a4fbb77/pidoruwasujiwigajimelesu.pdf
    • https://uploads.strikinglycdn.com/files/64c8ea2f-6f48-4b26-9660-5914d2ddf0ee/movuvagomejozajopomapodi.pdf
    • https://uploads.strikinglycdn.com/files/c4062fb4-788f-4934-bf2e-f15a252e5091/zelda_wind_waker_download.pdf
    • https://uploads.strikinglycdn.com/files/8b961813-76b6-4aa4-a2ce-2efc57a692c1/76535760721.pdf
    • https://uploads.strikinglycdn.com/files/1b1567bf-18c7-46c3-8ec8-9f34cb68f12f/netgear_wndr3400_firmware.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_off0000deac.bin
1561171fd7e386cc88183d298109747695241d34b2050c2493365e49c9cc5492		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 4760 bytes
font_01_sfnt_off0000eece.bin
b64b5fc1bf3c38c6b6e7fa7218f9c99fc53f8e2d91a48aed53a6cad76b9aa82f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 10504 bytes
font_02_sfnt_off0001123d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 4324 bytes

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