Malicious PDF — malware analysis report

Static analysis result for SHA-256 549b5bcc76219d99…

MALICIOUS

PDF

99.5 KB Created: 2021-03-24 00:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47fb00cc01dfae0760d217a66962c6d9 SHA-1: e6fb15a02f9a2a0229e1544cc073413bb64ce562 SHA-256: 549b5bcc76219d99e4c4b232736d38150bf2a907af1f800c4bdc435661f4aa5f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for malicious content. The primary malicious URL identified is zajinet.ru, which is likely used to host or redirect to a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=c%25C3%25A1ncer+de+pulm%25C3%25B3n+tratamiento+pdf
    • https://cdn.sqhk.co/xilasexiki/hk5igge/munefiwugilik.pdf
    • https://cdn.sqhk.co/musutalivun/cfI7he5/bekuzur.pdf
    • http://legalvictory.group/fiori_3_guidelinesrzf29.pdf
    • https://cdn.sqhk.co/zolilobup/jcggjgc/69966079823.pdf
    • https://cdn.sqhk.co/gixixutiji/CJgi0jh/fonts_in_use_60s.pdf
    • http://wukosuwusa.iblogger.org/87583532599.pdf
    • http://50offit.pro/is_usyd_goodtiil9.pdf
    • https://cdn.sqhk.co/jozazixefuf/gJnOM5s/bubble_shooter_snoopy_pop_bubble_pop_game.pdf
    • http://dujufevotudamo.iblogger.org/what_is_long_run_production_function.pdf
    • http://helplnstagramoffice.com/last_day_on_earth_survival_watchtower_electric_generators17wp.pdf
    • https://cdn.sqhk.co/daruluneti/CnTNhh7/fiboxebebel.pdf
    • https://cdn.sqhk.co/gixekoji/OihZohi/merge_magic_treasure_chests.pdf
    • https://cdn.sqhk.co/bumadawab/ijQYIii/98254793187.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_1345480ef8414b6692da98e32da8d4de.pdf?index=true
    • https://s3.amazonaws.com/rimepusox/gcf_lcm_worksheet_kuta.pdf
    • http://tozopovudot.epizy.com/all_power_1600_psi_pressure_washer_manual.pdf
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_04284a1e9e8746fd88a97a5b643fc713.pdf?index=true
    • http://dozirojaj.rf.gd/android_emulator_windows_10_hyper-_v.pdf
    • http://tisumejokilufon.rf.gd/dont_let_stereotypes_warp_your_judgments_summary.pdf
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_55f7b34b5a48470d848725410b1d6229.pdf?index=true
    • https://s3.amazonaws.com/lebaxa/45194388703.pdf
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_0f4590020ef045f0a4958ad02d6ab58b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://medlineplus.gov/spanish/lungcancer.html
    • 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_off000144f2.bin
f2378ddc836737bbb5ce15158d65317f39b8d02fd50b4bf40ad67a0534cb51d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144F2 5396 bytes
font_01_sfnt_off00015661.bin
096627aeb5b5233e5334e9a6b31aac9c750ad536af52e4917fb6597afdf39163		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15661 12308 bytes

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