Malicious PDF — malware analysis report

Static analysis result for SHA-256 e874c2d5cc31cb0f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-16 18:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7252ae2e239aac6310cac837db85855a SHA-1: 7ba168c8db1d9755910d701dbbffbc01ad23f13f SHA-256: e874c2d5cc31cb0ff0e23392a7040cbd332e8728f08c43fdefc5d54c73349acf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URLs, particularly those associated with SEO link farms, suggests the document's primary purpose is to redirect users to potentially harmful sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=mongoose+malus+used
    • https://cdn.sqhk.co/kipaselofuza/iihUIHw/microsoft_teams_apple_watch.pdf
    • http://wosozage.mypressonline.com/lonely_planet_route_japan.pdf
    • https://rinuvimasajef.weebly.com/uploads/1/3/2/6/132695862/fifaxo_jamovi.pdf
    • http://guzolemidova.iblogger.org/les_articles_partitifs_cours.pdf
    • http://zawugudumi.getenjoyment.net/setting_citizen_blue_angels_watch.pdf
    • https://cdn.sqhk.co/segenapiza/I2UEPia/underseat_storage_for_2020_toyota_tundra_crewmax.pdf
    • https://cdn.sqhk.co/dogutadova/yOL1qhh/cake_decorating_ideas_autumn.pdf
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/5065186.pdf
    • https://cdn.sqhk.co/xovenekot/q2Qhfhe/drunkn_bar_fight_psvr_update_2019.pdf
    • https://cdn.sqhk.co/tirazirevemu/du0gijf/92444386746.pdf
    • https://cdn.sqhk.co/pozazoji/Jibijw2/datagilelawazu.pdf
    • https://cdn.sqhk.co/mogizilo/zjbgjwn/34547050003.pdf
    • https://jezulusawuse.weebly.com/uploads/1/3/4/0/134000263/lelurekukom-nawatokofedema.pdf
    • http://mebovaduzi.mywebcommunity.org/wordpress_user_enumeration_fix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jitemawuvefogox.epizy.com/rugalipuxagizedavut.pdf
    • https://s3.amazonaws.com/tesodagiwor/ruzarizukifoli.pdf
    • http://nejovafejasujob.rf.gd/42035039210.pdf
    • https://s3.amazonaws.com/zeworibuzoza/are_they_making_a_new_harry_potter_movie_2020.pdf
    • http://posijibanif.epizy.com/28582202783.pdf
    • https://s3.amazonaws.com/kubafezin/deus_ex_mankind_divided_hacking_guide.pdf
    • https://s3.amazonaws.com/legipalofi/xajigazufepaf.pdf
    • https://s3.amazonaws.com/tesotiwapax/invisibility_technology_seminar_report.pdf
    • http://sanugifop.atwebpages.com/square_of_numbers_from_1_to_50.pdf
    • http://potopaf.epizy.com/24021267018.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_off0000ef2e.bin
52434e70166aa7619bcae2a8bdb75598acaaef70c9210cd70c51731cd29c3f74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 5056 bytes
font_01_sfnt_off0001005a.bin
c4536a607409a5c2fe98fb3e5090fffc3f4483a818c8e23982f7da88b6a24e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 11400 bytes

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