Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f26d05bb478178…

MALICIOUS

PDF

79.8 KB Created: 2021-04-08 05:39:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c27909f5b5d840e5e33329120ef649b SHA-1: cdb63c181120fc18c47384ff2900a5821fce04c4 SHA-256: 56f26d05bb478178590e1f4c97491711885e92994b0223958d4108044332bf09
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs, particularly the one pointing to 'vilenefex.ru', suggests the document is intended to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=algebra+1+final+exam+doc
    • https://cdn.sqhk.co/rapovixovuti/igHnshf/72360634562.pdf
    • https://cdn.sqhk.co/mivezifov/ibhdX5s/84847272825.pdf
    • http://nutosuvitiraj.scienceontheweb.net/28385167710.pdf
    • https://cdn.sqhk.co/libewepigux/f4w3hag/zombie_shooter_hell_4_survival_mod.pdf
    • https://cdn.sqhk.co/baxemazisod/jfOhMhe/musefumukeluwi.pdf
    • https://cdn.sqhk.co/degavorofala/gUibMij/fallout_shelter_game_guide.pdf
    • https://cdn.sqhk.co/jivonaxadu/gghfigi/wazegigisokopi.pdf
    • https://cdn.sqhk.co/buvaboda/4UihXoa/ikea_desk_lamp_bulb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/navoburarovada/his_highness_abdulla_movie_songs_free.pdf
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_59a977088ba7446da848cbda4d3edb55.pdf?index=true
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_4f7d62dfb9854d3091668339582fe6a5.pdf?index=true
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_594f5643487643dbb0fac32ec7f041ca.pdf?index=true
    • https://s3.amazonaws.com/nonipesikiri/what_makes_indonesia_unique.pdf
    • https://s3.amazonaws.com/buponuwebi/jisazabelovuxulomekibig.pdf
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_4e7051784b004f89aa6675987f7c5e96.pdf?index=true
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_13de4ed3d63740ab94e3af253b7715a5.pdf?index=true
    • https://s3.amazonaws.com/vonuxagupeduze/95353697449.pdf
    • http://kifesafijupesob.onlinewebshop.net/joxekakirakipojupibaje.pdf
    • https://s3.amazonaws.com/winumigutam/85023685134.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_off0000f910.bin
baf05d3fb1ca2594c0240c2c96fb9ce099572cbce5076b7a7e0ffd6da18c47f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 5412 bytes
font_01_sfnt_off00010b75.bin
2938e212593a94ef5871e96ff7a7b9ed7918e404f44796d6ba3905fed2de0efb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 11372 bytes

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