Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4439f2eb98f75b…

MALICIOUS

PDF

80.1 KB Created: 2021-03-29 06:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1df9262b877b7557d522da0cf44c03d SHA-1: e1e6b4cc0d449d0c0b718fcee9139482f99327cc SHA-256: 4a4439f2eb98f75b8024724384cc9e29083a8540fbc127fa738cc12e29a7e7f1
164 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to other PDF files, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a "download button" heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=place+value+worksheets+for+grade+5+cbse
    • http://wozonos.22web.org/97034661802.pdf
    • https://cdn.sqhk.co/berazanoga/jfFHst6/kiwunuvotoli.pdf
    • https://dovasivenumi.weebly.com/uploads/1/3/5/9/135965427/kiwutiwavitago.pdf
    • https://cdn.sqhk.co/daladovum/4KLhaih/berkheimer_tax_forms_for_employers.pdf
    • https://cdn.sqhk.co/jabosuve/hjycqjh/condado_tacos_menu_calories.pdf
    • https://tipujinozubuva.weebly.com/uploads/1/3/4/8/134883375/3103080.pdf
    • https://cdn.sqhk.co/zabitokepum/aBJBvue/wazogivutab.pdf
    • https://cdn.sqhk.co/tumowara/bjbghji/bataleniludulelililis.pdf
    • https://cdn.sqhk.co/sidogorego/jcjtUxG/nanifex.pdf
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/pusozomak.pdf
    • https://zawevujavesid.weebly.com/uploads/1/3/2/8/132814930/teropofadufoz_tokok_ruxoj.pdf
    • https://gumotijilazu.weebly.com/uploads/1/3/1/6/131637190/kivasepaxawukaf.pdf
    • https://cdn.sqhk.co/molivovuki/iiE3iiE/35909943148.pdf
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/5611870.pdf
    • https://cdn.sqhk.co/resesexiraf/crSmwhi/16544622125.pdf
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/kagebowekoxugo.pdf
    • https://cdn.sqhk.co/binuwaxe/BthbhfZ/puzzle_bubble_game_online_play_free_download.pdf
    • https://sazimopugis.weebly.com/uploads/1/3/4/6/134611647/ebbe446548.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://govogudumig.epizy.com/relomikazimebitaw.pdf
    • https://s3.amazonaws.com/bulolimepol/28493051647.pdf
    • https://s3.amazonaws.com/zusevamasor/white_christmas_movie_music.pdf
    • https://s3.amazonaws.com/jezobasit/80112220268.pdf
    • http://novademovu.rf.gd/vimibesi.pdf
    • http://robebiwasufilu.epizy.com/c._r._p._c_act.pdf
    • http://sezajurul.epizy.com/bellarine_rail_trail.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_off0000f8f5.bin
52b0dfc95b9d7dc31461dd7735aafc8252e1926d4f8090140a5d84e92c247bc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 5764 bytes
font_01_sfnt_off00010ca9.bin
c5328074f6f4fa9f563fb6f25ad9e27ef96da343a14eb474650066eb0e9aea7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 10944 bytes

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