Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71429ce12bd1c5c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 04:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46f9ab5cda9816a2572cbceff2f39996 SHA-1: e22b2e3b92f350f2c8e62dcbad52fa5ecd2c5011 SHA-256: b71429ce12bd1c5cf61a12427ee518dccd8e0adad3b55264117b7fb972254fc7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=harry+potter+hd+wallpapers+for+android PDF link annotation
    • https://theelementrama9.com/userfiles/files/15192778466.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613467eb32a3a---zipusixujamidi.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/petig.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/42980025237.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5f396635fa16240ade6598fa115db4dc/66257543481.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/24520886400.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/xiwemu.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/27450459176.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/firekuzeminidojojogikaj.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/gamuzomegub.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/82635840858.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/wosezexa.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/90486003956.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/xoripowasunabekotajewe.pdfIn PDF document text
    • https://retta-bg.com/userfiles/11827629669.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/48620472753.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/57305600222.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/zenakutujose.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/27333527401.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/kepujibajo.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/pomojerimepulate.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/72784429639.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/fuvidewuvanegokawimataxif.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/boriwigu.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/xubig.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_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 17928 bytes
SHA-256: 759d3f1ba85a2098c74981a3376af7535526cd33710cb465f8affbd01f867561
font_01_sfnt_off00010411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 10788 bytes
SHA-256: 3da3a50fd21c793dfb6a0c4886390c65368d37097e8078f0f258b4649fb7e9d6
font_02_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1