Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5102d356e00e27…

MALICIOUS

PDF

72.8 KB Created: 2021-09-13 01:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebc62dca91ff15014f0369aaadaed332 SHA-1: 39524909cf0a87e6594ff69a8e82526580a16ebf SHA-256: 6d5102d356e00e271ddb8e78d5b0dca12d8c4419014eaee58ef31de29c4a0195
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI redirection. The PDF contains numerous links, many pointing to unknown domains, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to these external sites, which could host further malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sonntag-immobilien.lu/userfiles/files/dadapitujubupuzobebut.pdf
    • https://5ky13lu3-1251.com/contents/files/44640249760.pdf
    • http://2m-m.eu/userfiles/files/78612983969.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/vajufivupelowedafa.pdf
    • https://menokatea.com/ckfinder/userfiles/files/51830135846.pdf
    • http://caydinhlang.net/userfiles/image/file/68232861365.pdf
    • http://karat-dobremiasto.pl/userfiles/file/98633870574.pdf
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/tobilerebusigexan.pdf
    • https://sukienmiennam.com/userupload/files/duxoge.pdf
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/85605338097.pdf
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/91983183012.pdf
    • http://koyomisushi.com/uploads/files/guzajozoti.pdf
    • http://bienchidan.org/uploads/files/tisagomogakukak.pdf
    • https://fenixfalt.com/userfiles/file/27989962692.pdf
    • http://itagqatar.zajeltel.com/itag/file/files/55864994303.pdf
    • https://podimercrm.com/img/files/bugobenebu.pdf
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/77458399088.pdf
    • https://hyundainhapkhau.vn/upload/files/57600294986.pdf
    • http://pune-india.info/userfiles/file/gimude.pdf
    • https://alubiasdetolosa.com/files/galeria/files/54835407740.pdf
    • https://lmcmanager.com/ckfinder/userfiles/files/vorexilesuxudas.pdf
    • http://splhardware.com/UploadFile/file/2021090613455273499.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/wuralelotak.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=jogos+com+dinheiro+infinito+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_off0000b7f2.bin
98868802dba3d32da37e0babe60d1bb6d1441d6f2aca8167b27c0b732115dd6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F2 17968 bytes
font_01_sfnt_off0000e415.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 16792 bytes
font_02_sfnt_off0000fc2c.bin
fcd2f7b53927a4b379c19be789793dbd622c408665f6c92afe890ce4d6040743		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2C 11104 bytes

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