Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa321218685280c…

MALICIOUS

PDF

73.7 KB Created: 2021-10-01 18:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b33b6d9fed99332ada87b647f87bda33 SHA-1: d7c917712a01d1a0186b0f89b6714937ba2c869b SHA-256: bfa321218685280c34941df5ea3739a084ed2906be4b91eadd0082b698310a6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://cructi.ru/uplcv?utm_term=tmnt+gba+rom PDF link annotation
    • http://nuraski.pl/wsg/userfiles/tuzibomaxugenokovu.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/44715353586.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/fobakedariwevosuxamoxig.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/68377806617.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/bikegowokafiko.pdfIn PDF document text
    • https://network-italia.it/file/wemusaviwiramad.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/53814258555.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/kexubumipusilafabivapelib.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/86771276664.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/ziwowutixuwowegaxux.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/70637082965.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/90392201836.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210908_193551.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/14507322479.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/jakuxilopulibavagufewiga.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/xotonimesu.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210915211415.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/16613685725.pdfIn PDF document text
    • http://runhouchem.com/upload/files/zixiku.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/nesorotukeserizijev.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/42964790511.pdfIn PDF document text
    • http://gaudi.tw/upload/file/jixov.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/35862446704.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143533d6f56a---pupugavinubewebimapupak.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/57457492279.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/vupopejukujomasusolojubim.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_off0000b947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 10116 bytes
SHA-256: b6b239ba86a064c77ff570007bba2ba832d3955a53ec825ca76b21aae0cfe005
font_02_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 19244 bytes
SHA-256: c2d27456577dd6be05eb1d8c67becaf672f869c43a3118eb79d43e3d7bd1ec95

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