Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0d71e5bcdcaf8e…

MALICIOUS

PDF

88.5 KB Created: 2021-09-09 03:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: a181ea59baefef14ba095994dbf461b3 SHA-1: 0d102ae1a7ded47db2e6df40976740bcbed605e6 SHA-256: 1d0d71e5bcdcaf8e91c8edf52b507e3a261c0fc175038894f3929789c506c7ac
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external URLs, with one heuristic specifically identifying a link to an algorithmically-generated URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://fastcredit.ge/userfiles/file/25919796672.pdf In PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/nomuniduzebiz.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/90224552700.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/32316042118.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/35607969455.pdfIn PDF document text
    • https://thietbigas.net/media/files/lefamodetisoza.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/51117535150.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/kovexowinadinudidogir.pdfIn PDF document text
    • http://retailcop.ca/files/33167112820.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/nadojirufenelo.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/67064335851.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/mepakerivapovoxuloj.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/96431390492.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/matogizububok.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/78770389732.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/surakotipazavo.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/pukok.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f182105aaf---31387569392.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/snv90hvaajlh5fbk81hqg4s8a0/81454696215.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/10358592926.pdfIn PDF document text
    • http://fitviewer.de/files/file/nakajilasazovifuxabodanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=excel+first+day+of+weekPDF 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_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 10744 bytes
SHA-256: dbc53e9b61403c98f1a28d7f46ee6ca0e238459053308081d8cdeae45a7fc768
font_01_sfnt_off00010ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 17636 bytes
SHA-256: f09752ea75f56dfbeb2e8be758869fe9a91eddfce4e59b5d224a9960a5054269
font_02_sfnt_off00013c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1