Malicious PDF — malware analysis report

Static analysis result for SHA-256 106b8d2784c7addb…

MALICIOUS

PDF

78.7 KB Created: 2021-09-22 10:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9706b4117acd6a9c0a9a78d1db8c7f4 SHA-1: b0a1617418c6de7020f35d283ab544a1b9db216e SHA-256: 106b8d2784c7addb4aa3d89b5cf11dba5545d84cacbe4c989057ce4500c56ba4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's used to redirect users to potentially malicious websites, aligning with phishing or malware distribution tactics.

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://oniceh.ru/uplcv?utm_term=action+bar+back+button+android PDF link annotation
    • http://digjamaica.com/app/webroot/files/15574347077.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/vativet.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/3814947603.pdfIn PDF document text
    • http://snft.ro/media/file/gupuxaj.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/zeser.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/girujikaxusonelilumenid.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/48647694674.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/fezevivof.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/sanizitaxufanod.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/11221569515.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/93475241061.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/digilununajivitu.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rakumeboxatadunum.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/sujorivizojekuwa.pdfIn PDF document text
    • http://ip-kamery.cz/files/file/bixuremadaporoxazafaje.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141379d7e3d6---vuxafakegozivopowepebapi.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/tudutago.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/zozukedugo.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/bitixepekexizodizaw.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/kifisejiguvopalopiboleko.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/movepupisubepevojubeboben.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/xomame.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/30716683477.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/14952515561.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_off0000cdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 18272 bytes
SHA-256: 19bef40242ddfbe741c3cac9addf3c2cc6b92202d43d312066418c4093660fde
font_02_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 10332 bytes
SHA-256: e8ae688cf8b71105eeea044bde270d872e14153336f5a90c9ebd32cd4fcdbbc7

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