Malicious PDF — malware analysis report

Static analysis result for SHA-256 145a653a3d0af091…

MALICIOUS

PDF

87.2 KB Created: 2021-03-14 04:15:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 824c2f7281e862abbf50dac40ca65942 SHA-1: d693d261200f06cab4eb59c1b276ff157fbccca0 SHA-256: 145a653a3d0af0916d331ad6145ab116b2db58d3b668cc2cdc4e658880a0520f
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, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least one pointing to a disposable hosting service and another using a UTM parameter, suggesting a lure to a malicious site. The document body, though heavily corrupted, contains text related to learning tarot and mentions wkhtmltopdf, indicating it's likely a crafted document for malicious purposes.

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://pelibifir.ru/123?utm_term=aprender+a+leer+el+tarot+pdf
    • https://cdn.sqhk.co/sozivowemin/hchgTjh/battle_zombie_royale_battle._io_2ds.pdf
    • http://vizojuzoninunoz.scienceontheweb.net/anatomy_and_physiology_nursing_notes.pdf
    • http://tatanip.medianewsonline.com/milwaukee_bucks_schedule_2020.pdf
    • http://wujejejifi.mygamesonline.org/wadenid.pdf
    • http://zawateminito.iblogger.org/vazasuwetaludulibij.pdf
    • http://wazinufezil.iblogger.org/flounder_gigging_guides_port_aransas.pdf
    • https://cdn.sqhk.co/guwaloxipete/gYGhggh/fallout_4_settlers_better_weapons.pdf
    • http://davupopebuwiser.sportsontheweb.net/sp-06604_aci_detailing_manual-2004.pdf
    • http://sixesijilolun.mywebcommunity.org/literary_criticism_research_paper_example.pdf
    • http://nigavereke.mygamesonline.org/total_gym_1000_manual_de_ejercicios_en_espaol.pdf
    • http://lulopoboxefon.scienceontheweb.net/how_to_fold_fisher_price_swing.pdf
    • https://cdn.sqhk.co/sesumaku/d5Bhdh4/food_cat_rescue_the_kitties.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vudatuvabejosix.epizy.com/blank_tennis_draw_sheets.pdf
    • http://dinixebun.epizy.com/15009717867.pdf
    • http://ligubulativov.epizy.com/natozubafugenorige.pdf
    • http://gawusozuf.epizy.com/buremazafegexosuniwuvop.pdf
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_2e088347ef1a4f7e9dfc97413957a9ba.pdf?index=true
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_33243ca1478e491aa8b5e8e33c83c60e.pdf?index=true
    • 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_off000107f0.bin
de91713826285b6180c09ef86eb4b457de36f8dcc7bf7a33de873c3bfae100b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 4584 bytes
font_01_sfnt_off00011789.bin
fa620d6cc06d8d9333c9043781c62bb4c3559da634190fa2fb23a1f4452e13e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 12208 bytes
font_02_sfnt_off00013f8d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8D 4324 bytes

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