Malicious PDF — malware analysis report

Static analysis result for SHA-256 6478221d2b121901…

MALICIOUS

PDF

74.6 KB Created: 2021-09-22 19:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a3046d2e61467c7e837efc299e72fe0 SHA-1: 8460a0b8e9c639b066bf9f09a83f2749ff735360 SHA-256: 6478221d2b12190177a7c70f71d1846ce27a0d74cbb85588ad46f1d989d41c59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=cars+games+apk PDF link annotation
    • http://botosani.ro/img/uploads/file/fovulatal.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/nofidinikomijeg.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/75000245236.pdfIn PDF document text
    • https://5uempat.com/contents/files/sagowelofuzojinex.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/delokan.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/81654194030.pdfIn PDF document text
    • http://zuche0551.com/upload/file/mifis.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/11017750171.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/nusales.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sogubetepinikivepija.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/jeriza.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/robepegogedafag.pdfIn PDF document text
    • https://posh.hr/files/77900888610.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/gudix.pdfIn PDF document text
    • http://bamila.vn/luutru/files/dumuvo.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/43794636493.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/15444758186.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/23809547605.pdfIn PDF document text
    • http://yongqingtech.com/d/files/veparinutazaxujopip.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/xoxujumirix.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/28477384526.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/nimugulujulonuzaw.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/15941741978.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/sofav.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_off0000c264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC264 10256 bytes
SHA-256: 76e05788d52c4a234bfa0e1df3a1a412e45f09aa02ca1a91357dd20dceb097f2
font_01_sfnt_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 16928 bytes
SHA-256: a6bbaa71b355730a056d4667b4c8b5b19971f6ce709508bef15f744561e4df84
font_02_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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