Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fc2d99a874f179…

MALICIOUS

PDF

95.6 KB Created: 2021-03-14 15:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f528c931c26d8e1088fe9c4969f3ca6 SHA-1: 1960c448c4cea7dcd235b1958959da4a7620b25f SHA-256: 49fc2d99a874f179ce380431083587346eae092d7d44959c29fee0b0e511652c
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('midufefew.ru') that is likely used for phishing or malware distribution. The PDF structure and embedded content suggest an attempt to disguise malicious links within seemingly benign document metadata.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=murmillo+gladiator+facts
    • https://cdn.sqhk.co/nivavepe/iaZjbBF/nidez.pdf
    • http://xifuponek.iblogger.org/tijopagurimesibetamoneg.pdf
    • http://kijenakewu.iblogger.org/74864891073.pdf
    • http://faponabon.mygamesonline.org/31449947225.pdf
    • http://pawomodom.medianewsonline.com/wejosinolurotufakok.pdf
    • http://fusojosejivo.iblogger.org/cooler_master_storm_trooper_window_side_panel.pdf
    • http://wejuzofibab.medianewsonline.com/loguduvetepixelororupi.pdf
    • https://cdn.sqhk.co/loganidob/jMJa5gd/zowiwezavudow.pdf
    • https://cdn.sqhk.co/fivufotimad/cjeKvr4/french_beginner_test.pdf
    • https://cdn.sqhk.co/ruxagoxoman/OZbe9hd/best_rally_car_game_for_xbox_360.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vibakiwijikilok.rf.gd/kemejabiwobo.pdf
    • http://pawepeg.atwebpages.com/lord_of_the_flies_study_guide_answers_chapter_3.pdf
    • http://dewelimu.epizy.com/anatomy_of_human_teeth.pdf
    • http://sidepojedava.myartsonline.com/how_to_build_a_creeper_farm_1.16_java.pdf
    • http://rowagaparik.rf.gd/kindle_paperwhite_lee_formato_epub.pdf
    • http://mojelol.epizy.com/nexus_9300_ordering_guide.pdf
    • http://toberijalija.rf.gd/42205689537.pdf
    • http://fevunurinowigi.epizy.com/phrasal_verbs_with_meanings_in_odia.pdf
    • http://dajivetu.rf.gd/83234170966.pdf
    • http://figedid.rf.gd/87937898638.pdf
    • http://vavixatobuzi.rf.gd/pusomolapigofagifojo.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_off000132a6.bin
d01c1707efc41d6561a5fa9d2296b61389305dd0e6b48fbbf8e456b219f6b645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132A6 5344 bytes
font_01_sfnt_off000144cb.bin
4fc7515b7c253104563ad9b31b42d5f0355a73a17cc9dfe2649c60b6f6b2bf2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144CB 14056 bytes

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