Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6f4c995349d7a6…

MALICIOUS

PDF

79.9 KB Created: 2021-09-23 02:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5d9f6e3644979a9b5539641c5e97595 SHA-1: 556812fb6b754170173c7ff253ceb25e0d0040ab SHA-256: 6c6f4c995349d7a6e767e29ce03f1c5f51fac9d4847fb3694974d091e73a78e4
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. This script likely attempts to redirect the user to a malicious URL, as indicated by the presence of external URIs. The ML classifier and ClamAV detection strongly suggest malicious intent, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354636ea0bb---zatazomobomovupilodesuni.pdf In PDF document text
    • http://studiomilano.eu/userfiles/files/jekilub.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/dizefelomesilumuzasafigim.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/xariru.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/tovopelinid.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/xumumunukepiripubo.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/48588318767.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/19638487549.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/xawovak.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/xatipozadepi.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/dc988abda3a8f3f37b79f69d213176c7/wugobunitus.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/57148393971.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/13184892058.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/1190450793.pdfIn PDF document text
    • http://akademibt.com/resimler/files/90234827000.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/38590725822.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210913011421.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/vududawadukaxevatisuvase.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/razutisesop.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/71579316323.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/jorabumaxijolidarigas.pdfIn PDF document text
    • http://short-story.ru/upload/file/18708456860.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/81506701971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=watch+desperate+housewives+online+putlockerPDF 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_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 10948 bytes
SHA-256: b3bceb346b29388cf635e513d7369376ea4f54574a4687f97a8cf3bf16e05297
font_01_sfnt_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 16640 bytes
SHA-256: af14cf1d8dc5a0e1fcf7de3a2a20bad108df09565a0a233ecfd66fa8794695ab

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