Malicious PDF — malware analysis report

Static analysis result for SHA-256 036c6bae02f2468b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 00:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e0d6f09ec0868f5bd84301cfc51965a SHA-1: 6d535af2fe1a29f303f80f4bd444df89dd15b649 SHA-256: 036c6bae02f2468b62f756884f108bc8d9e2a9b43195edee2cfd4712c2ff9768
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm structure strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=icloud+drive+apk PDF link annotation
    • https://cancelaria.pl/galeria/file/gapanefedafefaxa.pdfIn PDF document text
    • http://cortabellanews.com/userimages/51833461713.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/newofepi.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/mobeluma.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/46792196700.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/xulajafimaxikivo.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/60256601851.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/jabevipitifuvorosirixara.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/dovifetunup.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/7074adf9572eab08cb2a327f73e8c4d8/71681728349.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2d96b162bc90c54ac0418a6d6da8767f/sujowakezibujagaleb.pdfIn PDF document text
    • https://digireg.cn/upload/jilemimazedoxekote.pdfIn PDF document text
    • http://fourfoods.com/images/files/wajodosamukipozawenadov.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/relopeveratikufabewa.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/lezirakufurigenifotuvi.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/bafulolopawuberejudefevew.pdfIn PDF document text
    • http://humanlitech.com/files/files/sapan.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/bugigosalipixovagadeje.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/32814008674.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/sosadiva.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/62957762584.pdfIn PDF document text
    • http://domuran.pl/files/file/72998389383.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/57764779858.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/88609630259.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_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 10344 bytes
SHA-256: 9c05f9ae5d36a6a59412d54115691c5738af543117d35d2d0ab32f94943abf8f
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB6 18252 bytes
SHA-256: d088461ab945b92f2ed5447044343b79767e7c3d00670eb0b8c676583a8444f1

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