Malicious PDF — malware analysis report

Static analysis result for SHA-256 857183bc520d4676…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 07:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9edf98a0f4af5f1317819c61f8854a08 SHA-1: 39b24c1c39b5307c40a65d3b9602cbca517d9dca SHA-256: 857183bc520d46767bc5e0d329871d406d3b19c9f9630e44a6fe794ac18a7f8e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to numerous external URLs, which are often used in phishing campaigns or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://dishandspoonproductions.com/ckfinder/userfiles/files/jasinamudod.pdf In PDF document text
    • http://marine-inox.com/i/File/7311740307.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/98715090024.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/wisuwunusexudux.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/21725015296.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/faxuwopeje.pdfIn PDF document text
    • http://rococosofa.com/files/files/xikivorufuximidixeba.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/32856089529.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/33478494559.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/pabosafuwebisufex.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/16255896594.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/22375720875.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/vedovuzasaretavem.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/lozopem.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/80072303509.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/74857500927.pdfIn PDF document text
    • http://jiab.net/userData/board/file/xotitujajisolan.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/jutuk.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/palctrqji084pikb9aun2r1r19/wifazigolobedud.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/83551722367.pdfIn PDF document text
    • https://birotex.rs/images/files/fopazixuderagazo.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/24259582202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=can+i+move+an+app+to+my+sd+cardPDF 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_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 17128 bytes
SHA-256: b655955729d8309a6bcb9e0c25d47ba0f33376cb28cb5c6b66757916f36abf91
font_01_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 10840 bytes
SHA-256: 49e4fa7ff4d630af5b6af6f81c975d85dd7784448bfbc3225389b8d569efa97b
font_02_sfnt_off00013421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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