Malicious PDF — malware analysis report

Static analysis result for SHA-256 c981b7eb4e60d8a5…

MALICIOUS

PDF

74.9 KB Created: 2021-03-17 23:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c1a6fb0c34dd98a1c9705636b24ceff8 SHA-1: b1e4d69c25fa7521bfe9daf32370a8799c3b8488 SHA-256: c981b7eb4e60d8a5ada267c77285873ae01ea7fe6d9f14dd810063218277b9d8
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 0.9956

Heuristics 5

  • 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://vilenefex.ru/award?keyword=bodeans+soho+menu+pdf PDF link annotation
    • http://swiss-gear.store/daburinakamexunogejixuk58he7.pdfIn PDF document text
    • http://vknart.xyz/848748516674ogh9.pdfIn PDF document text
    • http://classkaod.ru/vitiful9mgxy.pdfIn PDF document text
    • http://moymagazin.xyz/arduino_mega_library_for_proteus_8vaifp.pdfIn PDF document text
    • http://prizinsta24.space/sowerubinuue0wl.pdfIn PDF document text
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/ribuselukisasol-soravo-dasarokamepuve-kewubibujobudon.pdfIn PDF document text
    • http://simcars.ru/14882314934owpe5.pdfIn PDF document text
    • http://easterthjg.com/dozodomaledelajdprmt.pdfIn PDF document text
    • http://futup.ru/67610386507jyma5.pdfIn PDF document text
    • https://dejamemetegabov.weebly.com/uploads/1/3/1/8/131856029/banofuvaledezomaji.pdfIn PDF document text
    • http://thrivewebs.com/kodatijowikanuponoxamotsljv.pdfIn PDF document text
    • https://defasoxajex.weebly.com/uploads/1/3/1/4/131405962/071bd.pdfIn PDF document text
    • http://idealica-ituficiale.website/kukug222e7.pdfIn PDF document text
    • https://nobopejulalajib.weebly.com/uploads/1/3/4/6/134621416/2258766.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/byron_katie_worksheet_questionsuhlqw.pdfIn PDF document text
    • http://extrameets.fun/jenibugoa2iq.pdfIn PDF document text
    • http://price-list.moscow/turkey_steel_imports_to_usbr1ju.pdfIn PDF document text
    • https://tujulita.weebly.com/uploads/1/3/4/6/134687611/zekozifasavabom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/add14fb8-f9f9-4e2e-961c-bc2054549c23/gefalopofigenoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a137e3-7346-4173-9996-0b833057aad8/define_traditional_folk_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2e576a-5bd6-4f45-a34e-6ff2f66621dc/92132820544.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_419e41294be945b5b17613f5bb5ed854.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_0cf4686291c94eababca15f411ec6cba.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_9f19079fa516421f8a809baabb786cf3.pdf?index=trueIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_dd2f4b4b4fda42399b3e30718380a284.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe88b6c-b4eb-47bb-b9da-8fb7aba2a3f6/pesigozugevonog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b686ab29-fdb8-4207-9d76-a9a21bc7c51c/mojotovimozexokajujuki.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_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 5200 bytes
SHA-256: 4a1fd4faa05654324c167946bf0b7dfd129bba84204c87dc99fb021ca4147990
font_01_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 11976 bytes
SHA-256: a4f3c620b6c6e3325458ba2bb30acf85bc9275afeb130358ae42b67f41116699