Malicious PDF — malware analysis report

Static analysis result for SHA-256 1688ea8c1e8c2d6a…

MALICIOUS

PDF

89.5 KB Created: 2021-09-12 13:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c72f1a2f44120f797f383cd113e5d9ad SHA-1: f12b91b65369c7e6ee661f408051fb2538083844 SHA-256: 1688ea8c1e8c2d6aec63947f64f8256def45b907f12d46f3b60e620294dfe2fe
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which are hosted on disposable domains or use redirector patterns, suggesting a link farm or phishing lure. The presence of multiple unknown URLs points towards a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/tobakenogu.pdf In PDF document text
    • http://mabifitness.it/userfiles/files/bokeborusuravojosun.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60c30e6a9---xuxozibevujimenuduzesogoz.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/dazezokujobefun.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce6dc71bd7---toxufikozisogojo.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/94115260122.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/70532769946.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/dufufujibufazavew.pdfIn PDF document text
    • https://wasael.com/userfiles/file/84785218716.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/80780958894.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/85892000770.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/buguja.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/gobifovibupofu.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/musakulunusabajowamubukow.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906222919.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/34391988540.pdfIn PDF document text
    • https://promise-land.com/upload/file/18652507772.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/mifefazata.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/53844315170.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/matipenemevagili.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/58124948674.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/42204589160.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/wixivijumetotisuli.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/felimefozebakamajew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kama+sutra+book+freePDF 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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 20948 bytes
SHA-256: cc9a64045686167f74af2cfce2c86a9cab332898fefae293c2a341954695e703
font_01_sfnt_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 10456 bytes
SHA-256: d94ad46985c106b38604840b8b07e511a7c813616c9a59fc704a2d0ef5f35d34
font_02_sfnt_off00014080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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