Malicious PDF — malware analysis report

Static analysis result for SHA-256 873aa3dcc6b5f183…

MALICIOUS

PDF

101.0 KB Created: 2021-03-05 09:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 13240740fc9edabee2499175dc41a380 SHA-1: 9fb705dc6bc503ee737b826c542d4e46d58206de SHA-256: 873aa3dcc6b5f183fce0e006a7e5ee8492c1b780fd8324426be472a2cf8dc5a2
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains or redirectors, indicating a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is https://xezojetit.ru/123. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=oracion+de+guerra+espiritual+por+nuestros+hijos+primera+etapa PDF link annotation
    • https://cdn.sqhk.co/fuluzagile/iVgijb6/vector_security_reviews_bbb.pdfIn PDF document text
    • https://cdn.sqhk.co/xodegajeriw/V1MghtE/only_one_airpod_working_after_reset.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/80833148834.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/iihgfjh/zombie_highway_roadkill_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rusefijow/ijjoTha/cartelera_cinemark_en_guayaquil.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/eibhahh/2020_election_ballot_questions_florida.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/80882594074.pdfIn PDF document text
    • http://vabadim.22web.org/sylvia_plath_quotes_love.pdfIn PDF document text
    • https://cdn.sqhk.co/vofemolat/jc5Sjhm/81321226919.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/ZggrhB2/dragon_quest_viii_3ds_review.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/junevonamizesebo.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/tcejax3/retro_collection_darth_vader.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/fheljce/22951300911.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/poguvelefa/clasificacin_del_derecho_subjetivo.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_dfa566b774ff4b279422302a5ce22b58.pdf?index=trueIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_db9cbef1ff864dcf98efb974e4c67791.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_a4763ff318704e4fb636393f70bb1624.pdf?index=trueIn PDF document text
    • http://bukemexuladorux.epizy.com/informing_beneficiaries_of_a_will_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/javanevoduravebezejiwuxoz.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/copd_exacerbation_guidelines_2015.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_cb5343cb38f144b99c92c9908c6f4cc3.pdf?index=trueIn 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_off00014ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADA 5588 bytes
SHA-256: db1cd2b9445b1d2fd54b285f0e36d453b11fb2227a3558774fc545a7fdf88909
font_01_sfnt_off00015dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DAE 12836 bytes
SHA-256: 63a14815220008203ce3ffd03073eb67a7e6c5e0ef804817905b4ec6f74f2ab3