Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9954df0ee2b16c8…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 18:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6300192b53c1618a498fb4a0381e2038 SHA-1: c24922bc7989b38b4a7bd6d64e1ae9c5dd93f024 SHA-256: d9954df0ee2b16c89747e3ced58a698109353e81596f22e69be04b03b31d550e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external URLs, many of which are hosted on disposable domains. One heuristic specifically identifies a link to an algorithmically-generated URL on a suspicious domain, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://takitech.hu/userfiles/file/89483371585.pdf In PDF document text
    • http://trongtinpc.com/luutru/files/68874214570.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/janigagitaxotaragel.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/93053974445.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/87445314102.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/doxofelovo.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/pazejetaruwenirubejoj.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/jedipenajarala.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/20505169012.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/vodaxuxujowajotov.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/jidedobosaborur.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/dabonuwa.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/tolebe.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/33440690463.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/98ti6mkuau0ufp2int05eb8le1/jufujox.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/wobasulusenuwutenozikatur.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/65920619754.pdfIn PDF document text
    • http://trivio.it/userfiles/files/90465479349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=amiga+kickstart+rom+1.3+downloadPDF 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_off0000aa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC225 16052 bytes
SHA-256: 8d178f65aeb1b0a2a78e32bc72a87f36b2d348e7b1272fcd8cd817f366b096dd
font_02_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 11032 bytes
SHA-256: bbc7c4ead94d38a289b61de99f61ffeb0a75b0305209e06f546d0dde59941611

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