Malicious PDF — malware analysis report

Static analysis result for SHA-256 24984d2a125cbe67…

MALICIOUS

PDF

109.9 KB Created: 2021-03-28 07:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 705030b433cc0f95781f95ee433b66be SHA-1: e73c0b651fca1a985bebe803562b39494a4d4559 SHA-256: 24984d2a125cbe672db0e80f0f994d26984cb7dda7d972eb0c6a6830366d4857
186 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 pointing to disposable hosting services, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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://botokaw.ru/strik?utm_term=wisc+5+administration+and+scoring+manual
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/5501481.pdf
    • https://nanagupuwaxa.weebly.com/uploads/1/3/5/3/135322083/7994479.pdf
    • https://pumoguviponurin.weebly.com/uploads/1/3/4/7/134773216/4151423.pdf
    • https://pafuxasakilufa.weebly.com/uploads/1/3/5/3/135327400/5779113.pdf
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/54ec32bb0acdf.pdf
    • https://cdn.sqhk.co/buzovegom/gimgeij/bevoraluvepagatowaxodeb.pdf
    • https://cdn.sqhk.co/wuvevalor/U0IhgmX/50492919419.pdf
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/viwak-nufijizawe-xugonoxuvoxaguj.pdf
    • http://subuxiwubemew.getenjoyment.net/ascites_analysis.pdf
    • https://juzemadarerux.weebly.com/uploads/1/3/1/4/131437885/derosagawowota_xuzetud_deriwolonoli_jonakavokesun.pdf
    • https://cdn.sqhk.co/feguzuvubut/d4jhWgd/tonelunelurubowenumuki.pdf
    • http://favodokoleti.mypressonline.com/functional_analysis_screening_tool.pdf
    • https://lelameju.weebly.com/uploads/1/3/4/0/134040913/podasupedij-jebof-budefuvewu.pdf
    • https://raxokasovupix.weebly.com/uploads/1/3/5/3/135389905/dogiw_gowane_nefaxes_zabojagufedoka.pdf
    • https://fexagire.weebly.com/uploads/1/3/0/7/130775556/7227544.pdf
    • http://kufafukedexepix.mygamesonline.org/dentes_de_rato_agustina_bessa_luis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bcce528f-0aca-4cff-b110-3cc1f3f909ea/63791876772.pdf
    • https://s3.amazonaws.com/vanatul/el_amor_en_los_tiempos_de_colera_en_ingles.pdf
    • https://uploads.strikinglycdn.com/files/b2c18cdb-6f18-45c8-a09f-1757bd2df5c7/stihl_weed_eater_hedge_trimmer_attachment.pdf
    • https://s3.amazonaws.com/wegemebufojafak/jebibu.pdf
    • https://uploads.strikinglycdn.com/files/05ef4fc1-7872-432b-b634-69fafdc9978b/army_weapons_qualification_card_m9.pdf
    • https://uploads.strikinglycdn.com/files/2003bd4b-31a9-418d-8310-9f9e19de00dc/jutaxawapusifolofanokeniv.pdf
    • https://s3.amazonaws.com/nufidibodudulad/petsafe_stubborn_dog_collar_wireless.pdf
    • https://s3.amazonaws.com/voropa/ragupigisati.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_off00016a72.bin
dc60c1933c1fe8a8952878a0fe7b6708af9cb27768bbd1b5ce7df96109e3d2a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A72 5396 bytes
font_01_sfnt_off00017cc6.bin
3345ddb8558d8ec037ebb3448e229d8b5072489d5ba1e6894ec89f81a8a64355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17CC6 12580 bytes

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