Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b9a16d38b491e7…

MALICIOUS

PDF

63.5 KB Created: 2020-12-28 01:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c983b0391ec61e81b73b2cf5cc266bf0 SHA-1: bcf7916dfaaab71be65729b2638a2512f40c23e7 SHA-256: d8b9a16d38b491e7911a483995909ce19b52cc6605e70cc3dae1a3b3462d1d18
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and the link farm heuristic point towards an attempt to exploit users by directing them to compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=metal+world+map+globe PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416154/normal_5fe51cf152bf3.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/wugep_xabodemukak_buripanepogemum_rerarabex.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/TcJOSai/3d_printed_fidget_cube_file.pdfIn PDF document text
    • https://pipudanino.weebly.com/uploads/1/3/4/7/134708560/mesinabax_mitupi_xogavo.pdfIn PDF document text
    • https://manuxemewawi.weebly.com/uploads/1/3/4/4/134443751/13645806bd040b.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwovodegi/jh1iiia/nsw_indoor_rowing_championships_2020.pdfIn PDF document text
    • https://kifitakuridugiv.weebly.com/uploads/1/3/4/7/134770331/paxunilelikixowoba.pdfIn PDF document text
    • https://morowuze.weebly.com/uploads/1/3/4/5/134580979/modejo.pdfIn PDF document text
    • https://cdn.sqhk.co/bibunifez/RRdwaSm/memimiratuxot.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/S1w9kvb/footsies_rollback_edition_download.pdfIn PDF document text
    • https://runevivapubate.weebly.com/uploads/1/3/4/5/134595370/sajuzilara.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/gisAnjf/dining_room_furniture_ideas.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/d6988d38-22e3-45cc-b4da-9316b4ccbddb/chunghop_rm-l688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb336f6-b2f0-4308-bc5a-9c2c50298069/xudatinixuduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6bc26c6-53ec-42bc-ab14-689909403830/avatar_1080p_subtitles.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_off0000bb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB88 5336 bytes
SHA-256: d8ddd5ec6c9212ec3302669ef52d1d3aab3736697bf6d0d6a5c2130f8c529a17
font_01_sfnt_off0000cdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB0 10584 bytes
SHA-256: 31e94705f64e9063d329b0e9312482d3b962c1c73279ca1ab641baf30384415f

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