Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d080fa897fa308a…

MALICIOUS

PDF

89.5 KB Created: 2021-09-13 18:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb6272ee2c4c21b998a5f9c0c42e64ee SHA-1: 92c0c169a0cb649f1dba58cda0f500d28dfd1ac0 SHA-256: 8d080fa897fa308ad3ee1d2e3134547764c488ac3edaac047ef7678c019b948e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the PDF is designed to host many links on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://nomylo.ru/uplcv?utm_term=nice+w+words PDF link annotation
    • http://goodlack.cz/userfiles/file/janapigesudifevewewuvozo.pdfIn PDF document text
    • http://tercovci.cz/files/file/jorojobokozibulonomajiwa.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/sovegilurogodaduxasenoz.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/26021706901.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613753525a52f---68377460449.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/pivajusiwojapav.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/bewofiperodobijedikowiga.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/28504118932.pdfIn PDF document text
    • http://agro-partner.com/Image/files/68195583061.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/17479697958.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/15560373359.pdfIn PDF document text
    • https://yellowstonewildlife.com/zirawonivosobekasomemu.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/siwigumagojuk.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/80711798002.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/deridozomifafojore.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/vumabosanojegirakiki.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/84349251528.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/rupunad.pdfIn PDF document text
    • https://dcimx.com/files/51223828033.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/gesisagesenas.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/padabisudok.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/94558668598.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/wivamutugavekupebokof.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/gunilel.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_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 18100 bytes
SHA-256: 53171fad8699586d8d555bf8c98db87020987fff3eee4449d1fb315e03fccfa4
font_01_sfnt_off00012a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A60 10016 bytes
SHA-256: 771fec87c1c724c0fdfab8da39dc5491f0895f22c4307a82128ad34161b6ba48
font_02_sfnt_off000140c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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