Malicious PDF — malware analysis report

Static analysis result for SHA-256 29cb07da45f2be06…

MALICIOUS

PDF

78.4 KB Created: 2021-05-03 10:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77882f28c3f1f7c26d63d25c8c7263c9 SHA-1: d0e6550538a8465c20aaea26657c66d93492d039 SHA-256: 29cb07da45f2be062470f718ff00da856a65f4ea71ef517e3bc6fc4ace233384
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to drive traffic to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=how+do+you+charge+a+vivitar+camera
    • https://cdn-cms.f-static.net/uploads/4375076/normal_603f8b7048da2.pdf
    • http://gusedori.iblogger.org/the_birds_and_the_bees_short_story.pdf
    • https://cdn-cms.f-static.net/uploads/4473651/normal_6060187798e09.pdf
    • http://sedouche.xyz/14242573650cveo7.pdf
    • https://cdn-cms.f-static.net/uploads/4462982/normal_605b99849eb92.pdf
    • https://cdn-cms.f-static.net/uploads/4466135/normal_6046ae8b4e08f.pdf
    • https://cdn-cms.f-static.net/uploads/4502511/normal_604342a494dc6.pdf
    • http://lejugowiwusog.22web.org/jepulimisifofavur.pdf
    • http://ritual-venki.online/royal_1830mx_cross-cut_paper_shredder_reviewsva6jb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/titugome/logexiru.pdf
    • https://s3.amazonaws.com/kotidox/kuvugusitumufiwexipoxas.pdf
    • https://s3.amazonaws.com/jivagajamav/38937466320.pdf
    • https://s3.amazonaws.com/budovewesekaz/pippi_longstocking_costume_australia.pdf
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_37547495d836469e8e34dd7f76881acc.pdf?index=true
    • https://s3.amazonaws.com/nonabafat/what_do_you_need_for_recording_music_at_home.pdf
    • https://s3.amazonaws.com/xotomisen/marvel_films_in_order_of_story_list.pdf
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_60f9cb1d9f764f658e629f89d44024e7.pdf?index=true
    • http://kivitaxefasutup.epizy.com/71846075436.pdf
    • https://s3.amazonaws.com/libeganot/the_crown_season_4_episode_5_soundtrack.pdf
    • https://s3.amazonaws.com/xokebore/31283111410.pdf
    • http://fefiraxubuviwep.epizy.com/possessive_apostrophe_practice_sheets.pdf
    • https://s3.amazonaws.com/pukaridimupo/mukikobonoxawojum.pdf
    • https://s3.amazonaws.com/kefodek/alexander_mcqueen_platform_sneakers_black.pdf
    • http://dixasimoxipux.rf.gd/fadamon.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_off0000f4ea.bin
a9b2a0d94793a40e0120047772c6232daef96b7e368a0655e3b615d3431bcd24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 5360 bytes
font_01_sfnt_off00010718.bin
e25386a9f33d363be84fa7018db6c6c7f98ba60ef4eb7652eccebb313fa95b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 10936 bytes

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