Malicious PDF — malware analysis report

Static analysis result for SHA-256 863e40afd6739cbc…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 19:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 002704cf02f8bb279dc9dda4824471d2 SHA-1: f221630d1aa4d9bb85476345684f9dc47568e603 SHA-256: 863e40afd6739cbc020a0e7fc97bb882896561ee01842a6f2858aa8e1fd9da7b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or visiting malicious sites. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gps-ambroisie.com/ressource/site-image/files/kumivaregunawegi.pdf In PDF document text
    • http://playoz.com/ckfinder/userfiles/files/melororerilori.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/zoxenu.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/sozujepazafupux.pdfIn PDF document text
    • https://777mto.info/contents/files/fositujifubojavitagi.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/xatamalarumoguzekoboreta.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/kajatotatetorizuvon.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/88883940080.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/98345006672.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/51529791834.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/woguvijajevunuruxogevuvem.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/81483948574.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/desekalivas.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/23824436090.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/rorovunal.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/75015207571.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161352fb4d0413---39185354498.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/vuwamigapaxituj.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/kilatifuli.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/jefenobozusi.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/biwokedolumilesufuna.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136205db2c40---tizenumosibogal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+flingster+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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 10852 bytes
SHA-256: c1fd1df91d75ff0300f1b964123a0586b1737b34e9f0d4f157c891fb263043a0
font_01_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 17868 bytes
SHA-256: f55184494caa1502b68d5086c379ab4a62f4264742a791819bb7f71c1b2ddccc
font_02_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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