Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf29430abfbb5e23…

MALICIOUS

PDF

73.9 KB Created: 2021-09-29 14:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f78bdaeace116245fc02a03c30391130 SHA-1: 1083d5cbe6b0f9fb8ef4369da4808f857adef6de SHA-256: cf29430abfbb5e2369f89f57539e1ad1ffddd9042815374c24c597286c47c396
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The presence of 'hack password apk' in one of the URLs suggests a phishing or social engineering lure. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its deceptive content and malicious URL distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://studiofagiani.eu/userfiles/files/18540149229.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161402fb00f076---13458603654.pdf
    • http://osayit.com/images/file/tedexabemifokopug.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142369595036---didomumuxol.pdf
    • http://vektor-bezpeki.com/userfiles/files/pakamitixij.pdf
    • https://ljlconst.com/admin/images/file/pepanunufupukogolum.pdf
    • https://guitarenko.fr/img/files/30610971167.pdf
    • http://exmar.it/foto_fck/file/dazapapasagenovi.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/wixoviwililup.pdf
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/mumeniruwagoki.pdf
    • http://kubablimel.pl/Image/files/popix.pdf
    • http://ok-poland.com/userfiles/file/83573963656.pdf
    • https://nedimgame.com/calisma2/files/uploads/74515071516.pdf
    • http://aimecostruzioni.it/userfiles/files/24291513402.pdf
    • http://flyingfish-stay.com/userfiles/file/tasuribupobavunuluvu.pdf
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/pesusivunalosamolud.pdf
    • https://fnb-concepts.com/images/uploads/files/tovufeterojivelufopuduv.pdf
    • http://ryyw.com/upload/files/2021/09/202109171704046823.pdf
    • http://satakantaresort.com/user_img/files/44468902943.pdf
    • https://halkum.rs/files/62732192127.pdf
    • https://tort-art.ru/userfiles/file/xenopilukatemufin.pdf
    • https://bobecoingatlan.com/uploads/editor/file/daluregabuj.pdf
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/zexovomuvo.pdf
    • https://uleiuri.ro/userfiles/file/lewasaragirozetagozodi.pdf
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/gejame.pdf
    • http://balcimimarlik.com/resimler/files/64762391139.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hack+password+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba30.bin
fb6855b65397c6962d88162458c3db456b36ab0565ccbf6c6a52ae5dc3856a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA30 19024 bytes
font_01_sfnt_off0000eac6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 16792 bytes
font_02_sfnt_off000102dd.bin
d623f5bc3f991c151932db834154c7a18a731b0101e84ca5e213c9ca0d62acbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 10204 bytes

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