Malicious PDF — malware analysis report

Static analysis result for SHA-256 b608890b97ab9145…

MALICIOUS

PDF

75.9 KB Created: 2021-03-22 02:34:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e6beb802f2970dbacc9e2a6d178f6f06 SHA-1: 2a12a4add8baf2a1a7776ce70ef97fe2faa5ec1e SHA-256: b608890b97ab9145b3863348a3828e17fe333b0cf2f68120716aeea4bae7c996
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous external PDF files hosted on various domains, likely as a SEO spam or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary attack pattern involving spearphishing via attachment to distribute these links. No scripts were extracted, but the extensive list of URLs suggests a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=modern+refrigeration+and+air+conditioning+21st+edition+pdf+download PDF link annotation
    • http://sakulog.sportsontheweb.net/podolidetewemuv.pdfIn PDF document text
    • https://musevurimimurom.weebly.com/uploads/1/3/4/7/134711136/razusadofijanaz-xesakew-raxewurutojatop.pdfIn PDF document text
    • https://furamakivagoj.weebly.com/uploads/1/3/0/8/130814247/1383880.pdfIn PDF document text
    • https://duturakesubepa.weebly.com/uploads/1/3/4/7/134703065/zibomiwatuj.pdfIn PDF document text
    • https://nipujari.weebly.com/uploads/1/3/1/3/131384055/235078.pdfIn PDF document text
    • https://liwobolavus.weebly.com/uploads/1/3/4/1/134131542/xaxusixuteb-gufore.pdfIn PDF document text
    • http://goldstein.capital/how_many_calories_in_taco_bell_beef_burrito_supremexw7eo.pdfIn PDF document text
    • http://sokegex.mywebcommunity.org/que_es_un_cation_y_un_anion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374366/normal_60019b260afd8.pdfIn PDF document text
    • http://rojibitakuvekuw.scienceontheweb.net/bokilonuwudedezadazakiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_602e2aa8489c8.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/7512244.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/hche8j9/rikupomewidoxogulow.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/zuwokogefira-xowasazepe-dodijuvu-fusikiki.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/ahf5he0/86143622581.pdfIn PDF document text
    • http://fineagencyy.com/husqvarna_rz4623_deck0xdor.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/aPojjZ5/90260972060.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/golf_is_not_a_game_of_perfect_free_download.pdfIn PDF document text
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/9587b7c00a6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kafotafuvodalix.onlinewebshop.net/boiler_operation_manual.pdfIn 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_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 5604 bytes
SHA-256: 7f584b8d24c163028704aa7240980ef29fcd41c07fa5c7b3b3341393f0f27b21
font_01_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 11332 bytes
SHA-256: c2b9a1c703adcdf4dcc849be8b9457ae19335d86af8308e7070c414c1c85231b

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