Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6eeb365f733b0a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 06:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f4b8db66330c5b4e8a17a514509d4cf SHA-1: a86bd873512f4cb7535edd2060f069c9491baf40 SHA-256: 6a6eeb365f733b0a87c02020766342c6dbaadb44c3a21661bd702c4ceb098f1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://allytemp.ru/uplcv?utm_term=gloud+ps4+android PDF link annotation
    • http://ebd.su/UFD/7623/files/67491093269.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/35079150429.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/benetivukida.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/24272288483.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/65281998349.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/kelugogajipo.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613745b846527---89636981581.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/wovilobukatiziwofiguzaja.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/tuzazelebo.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/fajase.pdfIn PDF document text
    • http://reflita.lt/uploads/files/bamikixanofonal.pdfIn PDF document text
    • https://huanghecables.com/d/files/towafar.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210905175835.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/7273566994.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/tepuj.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/bapirerim.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/pudukeb.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/sagerowaga.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_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 18800 bytes
SHA-256: 3e02dad5b17a8adec220f6837f82665fde5178d09e1977881e2d7312f2b8898f
font_01_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EA 10372 bytes
SHA-256: f51f46127b8cd2b4af484929cc666fcae7bf51e7e420ef10045703613ec9df0a

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