Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2f8815b8c3db01…

MALICIOUS

PDF

74.7 KB Created: 2021-03-24 18:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 204df038a5f4abb59fcb46fabb74dc23 SHA-1: 7c8e12df0c56421ac24257c4ec1c62f90733ca0a SHA-256: 1d2f8815b8c3db0174e9bd49b940cee13b1d779d19ffb2dbd054a62e8ce819c5
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the PDF's structure suggest it is designed to redirect users to potentially malicious external websites, likely for phishing or to download further malware. No scripts were extracted, but the PDF's nature and numerous external links point to a common phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/123?utm_term=kindergarten+alphabet+worksheets+tracing
    • http://oneplusonemain.xyz/breakfast_at_tiffanys_book_how_many_pagesifl9u.pdf
    • http://boomua.site/satamexisupomudowa43h2.pdf
    • https://cdn-cms.f-static.net/uploads/4492529/normal_6058f612c3894.pdf
    • http://piredvizhnik.com/410309957835yam8.pdf
    • https://cdn.sqhk.co/mekoposa/ua7Piep/iphone_x_ringtone_setting.pdf
    • https://befufagu.weebly.com/uploads/1/3/1/3/131384284/wezokowokazo-teputifili-gufavuzekugaf.pdf
    • https://cdn-cms.f-static.net/uploads/4424997/normal_6058686bf1da3.pdf
    • http://opros.xyz/xetovemudixilabokisabipexrn35v.pdf
    • http://shop50off.info/giganurovor4kpev.pdf
    • https://cdn.sqhk.co/zolewiko/ih30him/topozebusa.pdf
    • http://basiditdcf.space/dlink_dsl_2750u_configure_as_bridge_modeb2dc7.pdf
    • http://daniele.store/functional_data_analysisb5tdd.pdf
    • https://zonulezewuras.weebly.com/uploads/1/3/4/8/134890742/6722598.pdf
    • https://cdn.sqhk.co/gitovera/gfdij4J/10308015886.pdf
    • https://static.s123-cdn-static.com/uploads/4470821/normal_5ff8fe1137bbc.pdf
    • https://cdn.sqhk.co/seranowe/iiggc9J/drumstick_recipe_instant_pot.pdf
    • https://static.s123-cdn-static.com/uploads/4476418/normal_5fc819065540d.pdf
    • https://cdn-cms.f-static.net/uploads/4480904/normal_6042c46bcdf7f.pdf
    • http://sovetnik53.ru/how_to_restart_your_fitbit_versa_litey2zxc.pdf
    • http://deromgroup.com/93749087640wooqx.pdf
    • http://vamoktin.ru/espn_mlb_schedule_dodgersfd4qo.pdf
    • http://minuette.me/willy_wonka_and_the_chocolate_factory_behind_scenesvd4cp.pdf
    • https://cdn.sqhk.co/juzexokogim/jwgf3ie/54838773028.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e6a0.bin
c92cc9fe1a83d793fcb90051ce1fcf59f5ef53969562f5cc8ceaec7fcc3ed25c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 5600 bytes
font_01_sfnt_off0000f9ae.bin
f17933789e8dd90156be966484f692b5020fbdeecead1240e71cce2ab189c8be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 10488 bytes

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