Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0424b4eecdbf515…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 19:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 943330799449a06222f041bd9ac8adae SHA-1: ca6181e258d772900bcc5ca8b0c4c0dcd4b8467c SHA-256: d0424b4eecdbf515dceb4383c629777dca7c7c9d7cd20dd49254e8e25caa4004
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The presence of external URIs and the heuristic indicating a link farm suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=viper+for+android+no+root PDF link annotation
    • https://dnm.tw/uploads/files/202109200302057125.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/49558427035.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/78538439402.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/69288664239.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210914014432.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/54962817856.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/nodumidukododijif.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/780093fe139b064135c77e846ab6cd63/74123503408.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/debugepexozapelago.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/topijurij.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136ea6bc5d92---85114746059.pdfIn PDF document text
    • https://medius.sk/userfiles/file/vusoxesagaroruvodomegex.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/negudipaxo.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/16034637654.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ddf51aafd083c70ccbfa9e22686262d0/99485616095.pdfIn PDF document text
    • https://mkontakt.com/dat/file/virugulazukeneb.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/sodowiliwopog.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/lutijenebuja.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/89937896970.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/jugijafovosemezuvo.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/xedebufirebivimitepito.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_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 10244 bytes
SHA-256: b4ea7653791ff8eb5e7eaa9fc518ff8f22ec42b3ec279ca9eb68d71817f72a0a
font_02_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 17668 bytes
SHA-256: fa97c93b5199c6cd1aabdfeea7a7f0a7021b1bd945f69df9394b1e5725487c8a

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