Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad9bd9f4342a913…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 18:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad3e232c742dd57e8c1683d614cc81ea SHA-1: 1cd9f48be601eb708750b3034e7d5112112cbae8 SHA-256: 0ad9bd9f4342a913099bf4021b237173d12f6271924d32b8c221b04054eec148
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=malayalam+mp3+songs+download PDF link annotation
    • http://dpholding.ru/uploads/files/dupanasibipaminoluwigi.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/bawopetidok.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/mebadunagebu.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/risuf.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/gikazuk.pdfIn PDF document text
    • http://baoveantam.org/upload/files/66850181513.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/kigujobe.pdfIn PDF document text
    • http://orderkai.com/uploads/files/55451416004.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/69080860590.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/21618252252.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/gofijexapegukul.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/47773686502.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/gepuk.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/lukodafuv.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/18759384918.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zunodisuzipumapakugesu.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/14453555659.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nvbecrb1i11mjdrqmjg24luio6/70317689871.pdfIn PDF document text
    • https://vzglavniki.net/data/file/gitovini.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/lerixufuxunugilekamifisev.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd3c66bfe---34202603478.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/39119265592.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/veligodajuligojubebazi.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_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 16644 bytes
SHA-256: b3636ffcc6d9bae01d47be5ecf1723ac0ea0c0544e7dbff17066723e7187caab
font_01_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 10676 bytes
SHA-256: e5a93517ac080800d7f14a58a5413abd72583bcafa0d72bc1b8c71bbb25696b3
font_02_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1