Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d39e8aa0f9865ab…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 09:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d0159f1620a0e7a4f967b63b10ae57e SHA-1: bbce4313bd8c73dc0969d31d73e93fb564933c4b SHA-256: 9d39e8aa0f9865ab98166d9688f49611ade85fbef311eaa80180dc2a51f73935
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack, potentially involving a password-protected archive to bypass initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=how+to+use+barcode+scanner+android PDF link annotation
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/95177970270.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109230332265300.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/xobosa.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/fesipaxuzavesajexalokon.pdfIn PDF document text
    • http://linza-market.ru/upload/files/tivimesisuforotisiditu.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/gosaxidizeraxepikug.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/87534307224.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/85017342133.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/87736812124.pdfIn PDF document text
    • https://adikkedua.com/contents/files/jamefuzefazalutodijebix.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/guwarerusosazafolujakut.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/wosonefikubixovokipom.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/71769744564.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db7ec7fdce---13205484922.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/miriwubowux.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/80701838165.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/wotoge.pdfIn PDF document text
    • https://priscar.com/documents/files/78183543096.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/ririgu.pdfIn PDF document text
    • http://hkacca.com/userfiles/6723279917.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/fijogamidozupagir.pdfIn PDF document text
    • http://w-mill.jp/images/file/85090711131.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB535 10636 bytes
SHA-256: 0d94601e5da0d2d4c13a610be7240c125d9f9158e015e26b15761c734cbed22a
font_01_sfnt_off0000cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB8 17116 bytes
SHA-256: d82fb2621f8707027d8be11a1c14c290645abbaa9a6e6742723cb13cdaa09c4c
font_02_sfnt_off0000f8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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