Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f2bc25e8841800…

MALICIOUS

PDF

75.0 KB Created: 2021-04-02 00:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a5b315f36624e4aa2f133759441001d0 SHA-1: 1bcaceb99aa504272a72d595a129e0088e960f83 SHA-256: 10f2bc25e8841800a34b766c565277affd430a5f9b677c1c6884b2fec3f78d6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=echo+srm-225+oil+mixture PDF link annotation
    • http://keepmaxi.space/nitro_reader_3.5.3.14_downloadb0ncf.pdfIn PDF document text
    • http://fridgeservice.ru/shark_euro_pro_sewing_machine_manual_384ptbri.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/9652445.pdfIn PDF document text
    • http://fuposipavelolug.iblogger.org/94034165753.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/pegenisananigolip.pdfIn PDF document text
    • http://pet-guru.shop/553817580910llf9.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/8209714.pdfIn PDF document text
    • http://girlita.space/95344307354t0elp.pdfIn PDF document text
    • http://tur8osale.site/12567795048snexq.pdfIn PDF document text
    • http://zajilakofudo.scienceontheweb.net/french_and_raven_bases_of_power.pdfIn PDF document text
    • https://baludofagufa.weebly.com/uploads/1/3/4/0/134096440/2065b632.pdfIn PDF document text
    • https://kegalanomer.weebly.com/uploads/1/3/1/8/131856310/xuduzalaki_jojonigo_vuteve.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/xatufutafasi.pdfIn PDF document text
    • http://boost-store.net/9659003227046ixh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/devizakasom.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/sas_enterprise_guide_tutorial_videos.pdfIn PDF document text
    • http://jaruxuj.rf.gd/autocad_map_3d_book.pdfIn PDF document text
    • http://vapesonas.epizy.com/autism_fact_sheet.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_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 5144 bytes
SHA-256: ef12448e1c61a80734aa6a935f51041d845c11c5f36b8f5d7db4c8576248c938
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10996 bytes
SHA-256: 029db5517c8683a9aeaea65f501110f19a5328ea4dc5c816c00521933fcd0f7b