Malicious PDF — malware analysis report

Static analysis result for SHA-256 1945bc2877757f6c…

MALICIOUS

PDF

81.4 KB Created: 2021-05-01 05:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6c785fcf6df794808747cb1843a84fa SHA-1: 14113e411a58d07800fb5ce4aecaac8eeb003c4c SHA-256: 1945bc2877757f6cedd8df8e8903eb3f7873a54d04b6564c3eb4e23e0f024ef6
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, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a common search query, designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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/strik?utm_term=what+is+the+difference+between+amc+10a+and+amc+10b
    • https://cdn.sqhk.co/fowifabibu/d6J4WXZ/bimokazugaregexowaliz.pdf
    • http://reabook.online/96103453121kvv9d.pdf
    • http://load-bcp.com/55752358412de244.pdf
    • https://cdn-cms.f-static.net/uploads/4454163/normal_60419bffdc96e.pdf
    • http://nepatokada.mypressonline.com/principles_ray_dalio.pdf
    • https://cdn-cms.f-static.net/uploads/4501484/normal_602f4f37bf78a.pdf
    • https://static.s123-cdn-static.com/uploads/4389571/normal_5fdfc089a1fe3.pdf
    • https://cdn.sqhk.co/tuwetebep/gdzNage/residence_inn_san_diego_central.pdf
    • http://pogekoxuw.mygamesonline.org/76530840807.pdf
    • http://copyrighthelpcentral.com/wired_headset_pdp_-_afterglow_lvl_34r4oo.pdf
    • https://cdn.sqhk.co/xafogatok/jgePwgj/28694969212.pdf
    • http://melowew.scienceontheweb.net/64300966865.pdf
    • https://cdn.sqhk.co/numokafas/dc4n8id/26130847368.pdf
    • http://gizovivomiz.getenjoyment.net/paxukixibekapiresezegur.pdf
    • http://lizoguxumugef.mywebcommunity.org/82561834996.pdf
    • https://cdn-cms.f-static.net/uploads/4420025/normal_605d70a434ad4.pdf
    • https://cdn.sqhk.co/bitizulokiva/pqgcVgz/sosifuximaselezen.pdf
    • https://cdn-cms.f-static.net/uploads/4476436/normal_5fd2d82eb0531.pdf
    • http://wifunagidoli.mypressonline.com/angelology_trussoni.pdf
    • http://radogomi.mygamesonline.org/common_core_math_standards_grade_7.pdf
    • http://ecosbor.net/nebivukukitessv6f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fanalejowegop.atwebpages.com/xilolebadurawuseli.pdf
    • https://s3.amazonaws.com/xalasawu/dimuzosijofidegonexupeva.pdf
    • https://s3.amazonaws.com/sukobogixe/basic_geography_questions_with_answers.pdf
    • https://s3.amazonaws.com/samopakamefap/game_captain_tsubasa_ps1_for_pc.pdf
    • https://s3.amazonaws.com/nitatotol/hound_of_the_baskervilles_movie_1959_cast.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_off0000f25b.bin
495dc75d95a6a6f45ac0640accda880cdd7226211fb355277ff836c691f61857		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 2960 bytes
font_01_sfnt_off0000fcc9.bin
cc19018c8351cbb4671615afd6031d415f8f2522c6da6cac60144573c2a421c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 5668 bytes
font_02_sfnt_off00011000.bin
ea23a36930d949c30ffd4a5cfe74ad9c0b2fb14530b776f65e1b18f866f17ebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 10960 bytes

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