Malicious PDF — malware analysis report

Static analysis result for SHA-256 53aa358f843ab81e…

MALICIOUS

PDF

82.3 KB Created: 2021-04-23 16:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ff194502d2aea6f4e73e19b548b0be72 SHA-1: ea6c8dafeba77cb100fa193db235af685db3ac10 SHA-256: 53aa358f843ab81e2583b9647bd0aac841bf81ac62717f0ccc8638d9ddae6b28
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 0.9993

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://xezojetit.ru/strik?utm_term=what+is+preparation+of+the+gospel+of+peace PDF link annotation
    • https://cdn.sqhk.co/zefafulolit/ahjgjgn/chat_rooms_app_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/cbibjcX/viluwepegulunomuzew.pdfIn PDF document text
    • http://italdom.fun/1978367264304a5x.pdfIn PDF document text
    • http://onkoprofi.ru/bram_stokers_dracula_book_age_ratingf0rkv.pdfIn PDF document text
    • https://cdn.sqhk.co/timemowab/qTFiicU/knife_gate_valve_drawing.pdfIn PDF document text
    • https://cdn.sqhk.co/lovojekaboxi/cpgc5gf/47118473338.pdfIn PDF document text
    • http://goodnaturak.space/mefedivawinicui6m.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/qPAig3P/45045174470.pdfIn PDF document text
    • https://cdn.sqhk.co/waketeni/taaZUjf/city_car_driving_simulator_game_play_online.pdfIn PDF document text
    • http://getsol.xyz/nufukwlyyr.pdfIn PDF document text
    • https://cdn.sqhk.co/vurikede/hwTjerZ/star_girl_valentine_hearts_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/jGtiage/canon_camera_connect_app.pdfIn PDF document text
    • https://cdn.sqhk.co/wafabojunawa/tSgijbk/86218988535.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/51TAbhb/6468207544.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/mjaxhgl/vodafone_digital_prepaid_wechseln.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_7d286f603a81403da30f5a7c7cf1f134.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_ee05a50e068948d0b06637ef9eac4827.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liguwubore/99287849249.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/letra_de_la_cancion_stressed_out_en_ingles_del_titanic.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_d97bc0921e4e4e2e96639bc9a17f4128.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dekogamik/76754749703.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_ab407f2f1d414fd18bea43df29a6066b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zopenave/foxosivafisewukudi.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_11fc5ea9ff9340f697827a4f5afde2b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/19319529473.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_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 5288 bytes
SHA-256: a532805667105c13366c27c97d75fb798bf6ea40d958a3aafd276310f8760a13
font_01_sfnt_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 10716 bytes
SHA-256: c09188ba248c5ed9d5d0fd5fe3f00542e4e5584fba67baba97de68ec6bed249f

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