Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c3d7606e5960be…

MALICIOUS

PDF

77.8 KB Created: 2021-03-14 16:37:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c9486a4bddc4ed0694043f52906b51e SHA-1: 6cccae751fc12171ae302f7eb1c7d9707f4bbda1 SHA-256: 53c3d7606e5960be340d91a281702ee805f190d6e64770dec4f0522e7ef1991d
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, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrusted hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=strong+tower+bible+verse+kjv
    • http://xevamoz.mygamesonline.org/fender_twin_reverb_tubes.pdf
    • http://wumewil.sportsontheweb.net/dojusedavagilegum.pdf
    • http://lejidakoxinetog.mywebcommunity.org/roadmaster_bike_parts_gear_shifter.pdf
    • https://wuxudaboxebe.weebly.com/uploads/1/3/5/2/135297242/cc44252.pdf
    • http://zabolojisag.getenjoyment.net/what_is_the_correct_tire_pressure_for_a_jeep_grand_cherokee.pdf
    • http://sacredname.ru/sepebu0syh7.pdf
    • http://reduslim-shopofficial.site/80478186032vc1p9.pdf
    • http://003-center.ru/jabajiresulivutemazmbwgu.pdf
    • http://nowukusox.mypressonline.com/16995211315.pdf
    • http://kalowodopole.mygamesonline.org/41559416824.pdf
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/sudinezedor-piputo-falaru-fititogutosak.pdf
    • https://zelosadu.weebly.com/uploads/1/3/1/3/131379518/pamete.pdf
    • http://reduslim-shopofficial.site/ludofosububejugen8x64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0ab19d52-6250-4315-87bc-a89a88a91c5f/givadanenezuxulere.pdf
    • https://uploads.strikinglycdn.com/files/44ad00d7-11af-488e-a674-47a95d655d3f/wujunoxawosegunorajitivu.pdf
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_733f206612204c0c830c7f1cc51bc738.pdf?index=true
    • http://sitafefisoju.atwebpages.com/sat_math_1_sample_test.pdf
    • https://uploads.strikinglycdn.com/files/93562005-b3f3-4cf2-a793-7a39f90c55ca/what_does_a_customer_service_team_leader_do.pdf
    • http://gupatevefojip.myartsonline.com/reading_comprehension_games_3rd_grade_printable.pdf
    • http://bujijawuta.atwebpages.com/dekopitaxabebabiradixeg.pdf
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_7b1a60f1f1d1456d92a23d41e02e5fc8.pdf?index=true
    • http://peledopa.myartsonline.com/special_education_in_contemporary_society_7th_edition_ebook.pdf
    • https://uploads.strikinglycdn.com/files/b666f898-355b-44c8-b1ba-8364588d15f1/aa._near_me.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_off0000f26a.bin
53870ab65ccfc7e1d9f70eb82192371ebc906c5b70b9df0b23ddeee8bf3ee4cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 5176 bytes
font_01_sfnt_off00010439.bin
140774cfe325ef63f47ed029cd8d6c66c6c4308850894a58bc01c70045fc6a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 11168 bytes

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