Malicious PDF — malware analysis report

Static analysis result for SHA-256 083072adfa736b0d…

MALICIOUS

PDF

75.6 KB Created: 2021-04-14 22:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dd28a776da2c6ab374f0c90cbc6c6a43 SHA-1: 243f533e268a3f73b622f96f456049e365b015b9 SHA-256: 083072adfa736b0d13f9d1965b7bc2c3f115604fb49655ac6eba2e60e8c54182
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The primary URL observed is https://zajinet.ru/strik?utm_term=is+it+legal+to+sell+homemade+food, which likely serves as the entry point for the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/strik?utm_term=is+it+legal+to+sell+homemade+food PDF link annotation
    • https://cdn.sqhk.co/faroziwe/eheiahj/bevofomojasorusaruxof.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/psychology_of_human_behavior_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pofilese/jgjRiJd/malolozuzexenagelu.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/wSSiiji/bovusomalazumesovanep.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/hdXhdjd/adobe_acrobat_reader_full_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/eG3Fhgi/chess_online_duel_friends_online_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/ha64jcp/zombie_street_fighter_game_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/VJGPNK5/96898138929.pdfIn PDF document text
    • https://cdn.sqhk.co/doburazax/jhv6Agd/31558818626.pdfIn PDF document text
    • http://desararixiwikos.22web.org/best_java_programming_books.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_36d87b56605d4a8baab4e9d5e9c796c9.pdf?index=trueIn PDF document text
    • http://benamow.myartsonline.com/counseling_theories_and_techniques.pdfIn PDF document text
    • http://fawamoru.rf.gd/fofozulujulebaj.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_7d30a901c98547858cf88ca2457953b8.pdf?index=trueIn PDF document text
    • http://kulinikono.epizy.com/3492254066.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_4f2c662575fc402b83dd4faf921073c3.pdf?index=trueIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_64097ea195224beeacff3173bbb52d34.pdf?index=trueIn PDF document text
    • http://sudonek.epizy.com/pulonok.pdfIn PDF document text
    • http://kakapefetabol.rf.gd/2550550008.pdfIn PDF document text
    • http://saluwagasa.onlinewebshop.net/nurupufapoxubumugubuwadal.pdfIn PDF document text
    • http://rizibapuzaduxe.epizy.com/67319769182.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_86da7b6782a5469eae7c41f82f6a8999.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 5164 bytes
SHA-256: c69870b63ace206dc4b9145604b1f613beb6d51584d9b808c0709d00eed022fa
font_01_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 10708 bytes
SHA-256: 393891bfaecd52939defaeb184c982007b6341f251155e0b29d23a8bac91c6e7