Malicious PDF — malware analysis report

Static analysis result for SHA-256 891c8d58b055d7ff…

MALICIOUS

PDF

86.1 KB Created: 2021-03-20 22:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 236cbaee60cbe1d5ed55fdb8945262a2 SHA-1: 4b2c625de33a26589238c6ac54dd9f913aa38e98 SHA-256: 891c8d58b055d7ff517e3d20f5c8eae347b207f871c4946dc808992433bd7c59
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external links, suggesting a link farm or SEO spam tactic to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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
  • 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://seumenha.ru/wix?keyword=graphing+tides+worksheet
    • http://yesnutural.space/10326217459x3uyc.pdf
    • http://supportcopyright.net/13165389063yrlo0.pdf
    • https://cdn.sqhk.co/tirinakiweda/ajhehft/sacrifices_lyrics_fabolous.pdf
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/6552f40955ca0e1.pdf
    • http://neyroskakalka.site/438_days5ad4j.pdf
    • http://pokupka.space/rising_of_the_shield_hero_strongest_charactersohili.pdf
    • https://tokoposejod.weebly.com/uploads/1/3/1/3/131380771/gemitatojidilov.pdf
    • http://pinerapidsrr.com/dish_discounts_for_existing_customers3d6oh.pdf
    • https://cdn.sqhk.co/lanuniwa/hcMuyhi/toca_life_stable_aptoide.pdf
    • http://natbeach.space/lunatajizaxkqd7x.pdf
    • https://simalono.weebly.com/uploads/1/3/1/8/131856945/boripawuf-jajejub-kesirufusuz-nelonoxipapola.pdf
    • https://cdn.sqhk.co/sexuzoropa/Hhg4q4o/delayed_text_messages_android_to_iphone.pdf
    • http://sadovik.me/lego_switch_games_20213vd13.pdf
    • https://cdn.sqhk.co/fofotixoz/heYpS22/aviation_art_wallpaper_free_download.pdf
    • http://begdas.space/norton_reader_shorter_14th_editionccdmx.pdf
    • http://pycnidwzxc.info/bodovurifokuwif364a.pdf
    • http://vknacruckalaikov123.xyz/47419718235ovwhv.pdf
    • http://cryogen.me/beauty_and_a_beat_mp4_songeyro4.pdf
    • https://jaxevilin.weebly.com/uploads/1/3/1/6/131606955/9709268.pdf
    • https://sejusidanixaj.weebly.com/uploads/1/3/4/3/134374441/1012515.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_3a8ea42a1b024d808322230ebcdd1d9e.pdf?index=true
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_bfdfac1e762d460ebc4dad0500ab03c3.pdf?index=true
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_5c7dbaea0ec14994965fe1a9953ae7c6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ec5.bin
77e7f704d343c76681dcee135360e98e32f404f8d6a1e976850f2c52dbafc881		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 5376 bytes
font_01_sfnt_off00012117.bin
06753a110a59ae22598bab176ce257d5796f4e3ca47b47bd620630f46393c90f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 11832 bytes

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