Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bc15c617294916…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 19:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b97fca9d09ac7ac3e5cbd846dd1dab6 SHA-1: c6ca8896980c87ba479d197d2de772097f26b1f8 SHA-256: f3bc15c6172949169b767b6a7db464b04498eb88a1d3a2dfed40362b4d807f0e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=life+of+pi+ending PDF link annotation
    • https://cncunse.com/d/files/jimuwefutiv.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/kokukusisijijikixa.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/37844329738.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/32467929486.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/birazexi.pdfIn PDF document text
    • http://bamila.vn/luutru/files/27689397712.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/kopibuvepodaxibamik.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/nukadoror.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/xibizumukekewoxom.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/rivejalevup.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/62672249701.pdfIn PDF document text
    • https://dasyueshan.org/userfiles/file/sonuzafodixotu.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/n50m6m8gdqbtmoiidtcbbgfcej/51768657550.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136af905c765---megopedezalubamafavewokuw.pdfIn PDF document text
    • http://visoda.lt/ckfinder/userfiles/files/84052295562.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109180803482919.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/fepefodadazefa.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/41394075816.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/gadopamixuvububim.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/67860006438.pdfIn PDF document text
    • http://geotersrl.it/file/90050243009.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/90985136575.pdfIn PDF document text
    • http://computerdoki.hu/user/file/betisunaxewogevexoxazavo.pdfIn PDF document text
    • 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_off0000ae86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC698 16512 bytes
SHA-256: 08fbb3a2e578d0857a2c128ff261a8902661e019d49cc96fc3371150101cfb00
font_02_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 10056 bytes
SHA-256: 17829c62b208631009a5361a73a209c914069deefa92dd876d32a56cb330f572

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