Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84713aedbe78d80…

MALICIOUS

PDF

81.8 KB Created: 2021-03-08 12:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c598568b68ae09a8c01ffe725bddd494 SHA-1: be00f5e3de9605a32e6dc33e999dfc13da730d81 SHA-256: b84713aedbe78d80fc92bc34414a7f46dadaef0b4a33756f3e78eb5547d4fe85
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/strik?utm_term=how+to+enter+promo+code+on+pokemon+go PDF link annotation
    • https://xijeruwenuvu.weebly.com/uploads/1/3/4/0/134018409/binovipodosinek.pdfIn PDF document text
    • http://jobs-ingenieur.best/distribution_board_circuit_chart_template3hndg.pdfIn PDF document text
    • http://trells.space/41694289092pvil4.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/michael_fiore_text_your_ex_back_reviewsmxs85.pdfIn PDF document text
    • https://cdn.sqhk.co/fudimesa/rLiboja/album_maker_software_free.pdfIn PDF document text
    • http://nyvelsets.online/fusiwafidigudidusqzyy.pdfIn PDF document text
    • https://xugomijomib.weebly.com/uploads/1/3/4/5/134578432/robijolurimod.pdfIn PDF document text
    • https://cdn.sqhk.co/fadanade/cghjec5/jiwirileparenuduf.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/jggcwie/kanto_yu2_white.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/73092927275jmxw8.pdfIn PDF document text
    • https://cdn.sqhk.co/wodigajamu/nwBicgd/88262544066.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/a7hacge/kokanamid.pdfIn PDF document text
    • http://storeeuro.info/gabebulusopiviyeiyl.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/ihaMVkK/dekibowonekibomipazag.pdfIn PDF document text
    • https://cdn.sqhk.co/wobivada/QhjVjfQ/nintendo_switch_buy_online_uk.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/5590179.pdfIn PDF document text
    • https://teniroge.weebly.com/uploads/1/3/4/6/134693228/cb733d523cdc7.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/gjfcWhe/might_magic_chess_royale_heroes_reborn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowokil/86952594843.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/jipulusujomu.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/joxulosakuze.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/najivazofafivezu.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/lamuvijibuk.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_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 5092 bytes
SHA-256: 19fe4d720eebef73904ddeea738bae0b409e21fd9d2e8017be0345e7653d3594
font_01_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 11644 bytes
SHA-256: 21c7b078eff1175029b27a1b739d4b2201dd16d00a568bf1d19cf8d7469aea1f

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