Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d5dead97e9dd74…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 11:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1a7884e27a7babf693bc026f1e57d7aa SHA-1: a2b4d018f642b73530a96062b31457478585f802 SHA-256: 62d5dead97e9dd74ea1c7ca5fe1294e3888941fc4fb7acc8b72da17c860f1310
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://twinmd.ru/userfiles/file/kokisubisarifajuwaboz.pdf In PDF document text
    • http://bugskin.org/userfiles/file/56163955316.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01507750d---vemeputemum.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/tojefom.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210908182022.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/laresawexitilonedutot.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/4741970108.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/mifisufimutinijobabifu.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/912057568.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/mopufet.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/63545718072.pdfIn PDF document text
    • https://led7.ru/file/buzobi.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/mibusel.pdfIn PDF document text
    • https://hinaweb.com/upload/file/90879711171.pdfIn PDF document text
    • http://odumakus.com/uploads/files/dapipekaniwunulamewu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363ec0a0863---sazutasiridajezo.pdfIn PDF document text
    • http://taociren.com/upload/file/2109071348487907518irkcw5zh8kp.pdfIn PDF document text
    • http://17njl.com/userfiles/files/medegilesexi.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/semugesitomalozewijapu.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/89746955054.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/2689283687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bruce+lee+game+mod+apkPDF link annotation
    • 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_off0000b6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E8 20552 bytes
SHA-256: 40172c4fbd3e15f94c64580b451fa3731aefe1c1fe77834d5bf5d8f04fdb0422
font_01_sfnt_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 10640 bytes
SHA-256: 512c47060e92059612db2042ed11cfcc70444bc67b57a082c9365b517055b952
font_02_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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