Malicious PDF — malware analysis report

Static analysis result for SHA-256 694fbd2ad2365a25…

MALICIOUS

PDF

74.5 KB Created: 2021-03-13 18:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 952587b3e3d6d1ebfcab785882f83c8a SHA-1: 1c6e8c32be80e25541fd756b73b372ac5b27ae71 SHA-256: 694fbd2ad2365a25f9df78a6179bba6e546f72d36135d8949d0bfc05af95442b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a strong intent to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, suggesting the document is designed to host a large number of links on low-reputation hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/123?utm_term=stato+aeriforme+esempi
    • https://cdn.sqhk.co/kigimole/HbDXGjb/masha_e_o_urso_festa_entre_amigos.pdf
    • https://cdn.sqhk.co/noxomosanena/XG6vLjf/12157006043.pdf
    • https://cdn-cms.f-static.net/uploads/4422372/normal_60136a007bdf7.pdf
    • http://pixell.store/39872398524kyomg.pdf
    • http://yourbigdick.space/401866812025m00r.pdf
    • https://cdn-cms.f-static.net/uploads/4465694/normal_6038c25fbc333.pdf
    • https://cdn.sqhk.co/jivobukafon/u1YVii3/jadikod.pdf
    • https://sumiloruxefeme.weebly.com/uploads/1/3/2/8/132814276/1fa61.pdf
    • http://sexesex.site/dozesesomc89id.pdf
    • http://cherrypimp.online/busudoauqcu.pdf
    • https://madumowa.weebly.com/uploads/1/3/2/7/132710776/vatuneweraba.pdf
    • https://cdn-cms.f-static.net/uploads/4367916/normal_602d2ad1c09c0.pdf
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5fdaba55638bb.pdf
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/jatuzupikuwutenesot.pdf
    • http://tradebot.space/mitsubishi_lancer_1989_service_manualt1kch.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/da80d95a-0d46-4189-8a39-cb363ffb47a3/windows_10_all_in_one_iso_x86_x64_activated_free_download.pdf
    • https://uploads.strikinglycdn.com/files/3f001896-e117-4d73-bf88-05ebd9fb7b3d/a4_size_world_map_outline_printable_a4.pdf
    • https://s3.amazonaws.com/kiguteperilodu/66673568467.pdf
    • https://s3.amazonaws.com/fakuguvil/autocad_commands_list_free.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_off0000e327.bin
b2072115b9ee76eb2e2df776d7147dbb4eca5308e30120c038b8fc5cec46770b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 5120 bytes
font_01_sfnt_off0000f47c.bin
f53cf755bd34ad51679c60aee20d8fa6d43c7e091cb80686f4218a02f8a8937d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 12048 bytes

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