Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2df717437081b6e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 04:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6879aabc47a53815a25fbf48baaada2c SHA-1: 0a7198f005b09089c6ef77f4469993bdee7548cd SHA-256: c2df717437081b6e196b2c4c38ed2961cde3e8107a38bdc54b48573135c745aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for SEO abuse or distributing malicious payloads. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=2021+yts+movies PDF link annotation
    • http://tnslib.tools/userfiles/files/29034015351.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/takigebawetorubulodalokeb.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/vujixidadapeti.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/dozewagel.pdfIn PDF document text
    • http://zkpower.net/upload/files/vivugojepefusitid.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/41244945521.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/74724518138.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/banetipado.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/92773188499.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/41745687656.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/51400499599.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/numikibopijibuvisowopam.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210915_EF8A03BA472FB580.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e98ce3ef81---21332361468.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/pasegivoka.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/67310180894.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/golunelovenesaxitipik.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f339b45af45e70e1dfd7646f9f473fc7/60166779414.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/85903853935.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/jobizefisi.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/kifop.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/fatazamimagakixegibat.pdfIn PDF document text
    • http://ccadl.com/files/20210914122747.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_off0000b095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB095 10232 bytes
SHA-256: f5dd60c8b0bcd4c3cf3f797f95663663230af4611e85f4d325a9c3be0526a5aa
font_01_sfnt_off0000c7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B6 15612 bytes
SHA-256: b73537c3f7cbe3ebfb2857111595570f9575bd16b5c1d85be054d746245cb59b
font_02_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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