Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d8c3c6e8dd7fab…

MALICIOUS

PDF

77.7 KB Created: 2021-04-01 12:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c373099913134b3a981189a28608e6f SHA-1: 9ddae3de3e9fc826a08a65f7b97af9a8bf403356 SHA-256: 23d8c3c6e8dd7fab4bfa5331f8d84c6e5b4eeb753a45dafe304c51056da531d7
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-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://leonvi.ru/wix?keyword=corry+high+school+football PDF link annotation
    • https://cdn.sqhk.co/budufunewuf/jeYxbjc/military_cadence_songs.pdfIn PDF document text
    • http://taher-tcac.com/62099421168uyou2.pdfIn PDF document text
    • https://boxomuti.weebly.com/uploads/1/3/4/0/134016719/cf970a1.pdfIn PDF document text
    • http://falufob.iblogger.org/segitozukidebujed.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/lasamafedatumi.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/85137225027.pdfIn PDF document text
    • https://sexewowoko.weebly.com/uploads/1/3/0/8/130873923/jerovimi_tipexiremovu.pdfIn PDF document text
    • http://setopin.mypressonline.com/zumifapipewovasap.pdfIn PDF document text
    • https://wakavofidokevi.weebly.com/uploads/1/3/2/6/132681750/vugufumumo.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/ijh2jho/1325_dream_island_steamboat_springs_co.pdfIn PDF document text
    • http://intereriia.com/end_of_days_vinnie_paz_letra_espanolbsl97.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/glacier_bay_faucet_installation_instructions.pdfIn PDF document text
    • http://item-get.top/convert_bank_statement_to_csvd5oaj.pdfIn PDF document text
    • https://mukoxawav.weebly.com/uploads/1/3/4/6/134627731/4543070.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/thdEge1/30550837639.pdfIn PDF document text
    • http://instapodarok.site/96834642275ozzo2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://riperuzitino.rf.gd/acca_member_jobs_in_uk.pdfIn PDF document text
    • http://sonasekofuxix.rf.gd/affiliate_marketing_business_plan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 4972 bytes
SHA-256: b6a1eafc6a8738edc78f4f698a438036216bc9bed55c349cb193eb6528e112d3
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 10732 bytes
SHA-256: 046aa9c16509bed4f46d7ee8aa1dee19e43525145b36706138e916ed3f07102d
font_02_sfnt_off00011b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B44 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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