Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cab5868ebda9e4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 06:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 515cd6946c0e571380227cf76bb8685d SHA-1: 97c30c59d6235cb9343e1e5a887706fbf00908fc SHA-256: 39cab5868ebda9e46f2240d29eb8ffc2f87ea9f829032cabdaa903f36f754a1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, many of which are identified as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=pubg+free+for+android PDF link annotation
    • https://dollarplus98.com/images/upload/files/sirurusebed.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/komatijores.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/lotavupoduputupejoxo.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/wutekifusupu.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/lawuwigozoxuxuxawal.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90524e248---14705873005.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/bawaxukekenilimagirumum.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/43276426345.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/lebaxodevekabirir.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/tarikax.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eded9d95c4---24778940069.pdfIn PDF document text
    • http://gr-chem.com/upload/files/fusujipi.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/guriwepinozubebulole.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/24275669134.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/jipibidasewuwitejapibin.pdfIn PDF document text
    • http://slovoveri.org/userfiles/38035817434.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/55405776621.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/54199051359.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/93940652809.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/93469157083.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/36521460611.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/54135360915.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613870329b01b---tenetulirapewipumokabizit.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/kadupululagurak.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/zawosotazebumowibo.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_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 18652 bytes
SHA-256: 5d776636dfaa21c9e740c2557130dd91f82bc5ba7a647d83d10eb95e8b88c14b
font_02_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 10460 bytes
SHA-256: 5445ce4f4042666251cfca58841be0075141d6a49464a39db9bc2e37675332c3