Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8fc495aef2eb28…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 07:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab29cbf2a58e0ad9a1cdccdde5f76d6c SHA-1: e239f63083b403c0f2294111dde5484056ae403e SHA-256: af8fc495aef2eb2815f5d785a85d9251c2453b4a33448cf170fd4a7d3f6abdaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external resources, 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 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 sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=download+senki+naruto PDF link annotation
    • https://km2804.com/ckupload/files/29271664912.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/galurikibefij.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/99039105825.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/xenew.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/sizekanujivu.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210903_594F8EB1811DAA4C.pdfIn PDF document text
    • http://leguido.net/files/73172532013.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/ditidudo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0f2db0b28---55045060412.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/43773010867.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/60878597539.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/51365894416.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/41695347.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/woxipezawegawufajamofone.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/43541199608.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/jezowaninimegifa.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/kidapegowubuvo.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/27866310293.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/powisagogeborilasum.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/dccb0dd903b63ee742d9633769bdbec0/72741173854.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/wikamopozukijigela.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/73864251254.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/nilel.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_off0000d8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 17900 bytes
SHA-256: 23faf98ed8171abd1a621898bca5c1139de6f2b0e5827993bfc6a4a7110f0708
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 10520 bytes
SHA-256: 66add2a924a5d0ba8f11bb6bf30151a852778eb1fb7266c17fe2b9b8df391dcf

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