Malicious PDF — malware analysis report

Static analysis result for SHA-256 516a22ca28498477…

MALICIOUS

PDF

75.6 KB Created: 2021-03-14 16:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4e47683a76813e46f3074216efec249 SHA-1: 1877d0275d27d54a14ead2abb220c20a50a9590d SHA-256: 516a22ca284984775b4e60f02df872d01df1178ad18d124df1b63c3ff5a729fe
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable or unknown domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://xezojetit.ru/123?utm_term=free+printable+possessive+apostrophe+worksheets
    • http://prequester.online/sp_racing_f3_flight_controller_deluxepq69u.pdf
    • http://vnds-super.space/ruvibavisujufugixdjena.pdf
    • http://linza.media/sports_illustrated_swimsuit_covers_2018obzb8.pdf
    • http://endi-itali.space/jefulupavekujugefad8iej1.pdf
    • http://crawlmqyu.space/what_is_the_timbre_of_musicte4b2.pdf
    • http://tejajugumoneton.66ghz.com/android_os_draining_battery_s6.pdf
    • http://cleanup-sale.site/is_the_cruel_prince_a_duologyo1p6f.pdf
    • http://liketime.fun/zosodoselaj3zkfw.pdf
    • http://cleaner-inn.club/simple_human_soap_dispenser_will_not_turn_on0ha8e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_4042961ce0044327ac9e2e03c376e09f.pdf?index=true
    • https://s3.amazonaws.com/tevomenil/how_to_compile_jasper_report_in_eclipse.pdf
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_e11b546a369c417da84b5470694fbf37.pdf?index=true
    • http://kujazidi.epizy.com/can_i_freeze_coconut_milk.pdf
    • http://fezanigevuxuso.rf.gd/gexitenulivanu.pdf
    • http://jomedive.epizy.com/how_to_sync_remote_to_dish_hopper.pdf
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_8a393e532a324172bd5dca288a1c557e.pdf?index=true
    • http://nibedob.rf.gd/zezep.pdf
    • http://filexumif.epizy.com/wonorefu.pdf
    • http://sufizewuwavibu.epizy.com/samsung_s8_plus_android_10_update.pdf
    • http://lekekavom.epizy.com/zupokileg.pdf
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_d8d0ff1e55924918b9e53c54a716077c.pdf?index=true
    • https://s3.amazonaws.com/jeponowon/how_much_does_dollar_tree_employees_make.pdf
    • https://s3.amazonaws.com/mexijegedakol/faretubemuko.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_off0000e977.bin
15a4d8d49804291c605120e41bebf47dce4a7e2708b9a53a8200710ac8489116		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 5220 bytes
font_01_sfnt_off0000fb41.bin
650342c6827fa03a956a6496bef72fe81d28821483be2e2f1eac3f206392a281		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 10432 bytes

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