Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d94850bef1c9dd9…

MALICIOUS

PDF

79.7 KB Created: 2021-05-14 21:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f88dad943295a9071b73906d78a29749 SHA-1: b049264f8d7cfd7f85af39702563c6e3bc8439bd SHA-256: 1d94850bef1c9dd9348ddd4dbe4ace443d1caec086f63753a4efb124d53b075c
166 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses a password-protected-archive lure. 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gimoguvi.ru/strik?utm_term=which+of+the+following+password+attacks+uses+preconfigured+matrices+of+hashed+dictionary+words PDF link annotation
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/ganidewiwukodu.pdfIn PDF document text
    • http://helpcenter.business/degekowiwowapatekala4qd2z.pdfIn PDF document text
    • http://tortomsk.ru/rimuvarevadaka8v9xj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_60462705c6e9e.pdfIn PDF document text
    • http://getchambre.xyz/can_you_itunes_onto_chromebook3disx.pdfIn PDF document text
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/xujijim_bitajominizikal_murenuwoda_bofinim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fcfed1aa79dd.pdfIn PDF document text
    • http://lienforkid.com/86211249789xdv9n.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/vewabupuko.pdfIn PDF document text
    • http://topcreditreport.info/wusagubiwbwrb.pdfIn PDF document text
    • https://noduxexoretan.weebly.com/uploads/1/3/5/9/135993764/keloxasisadap_jubexejupom_laxevajizaxeb_danipulinizafam.pdfIn PDF document text
    • http://navaram.online/28000458499uu9c6.pdfIn PDF document text
    • https://gisafonenum.weebly.com/uploads/1/3/5/3/135323636/2947428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469626/normal_60367f5700937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_60198fd713428.pdfIn PDF document text
    • https://nunamifeko.weebly.com/uploads/1/3/2/7/132740424/magiluzutotumax.pdfIn PDF document text
    • http://sakhavto.ru/elementos_representativos_de_la_tabla_periodica_definicionblopl.pdfIn PDF document text
    • https://putavoguxula.weebly.com/uploads/1/3/5/3/135325624/dc894f37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5fda8d272d43d.pdfIn PDF document text
    • https://gukenesiwedik.weebly.com/uploads/1/3/4/7/134735424/nolugiful.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/xuzed/adventures_by_disney_alaska_trip_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/new_indian_movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/chakka_bajana_songs_ing_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/30666834828.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_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 5840 bytes
SHA-256: ac26879d3f65c116e883c67c8393730e54c0da8676b230eb517c2e7110786b0c
font_01_sfnt_off00010b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 10824 bytes
SHA-256: d39a51da744cb6e19e2cc812677c7d17260a03ececc2c7fb413bd2e90155b3cb

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