Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ae4fa171d98cb5…

MALICIOUS

PDF

68.9 KB Created: 2021-09-12 20:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47cd69bcfc02836bed351f27ad5a58f7 SHA-1: 541628a99bc457ee9a4ae2077c6c466ab14b28a0 SHA-256: 90ae4fa171d98cb5409202f041a8ecc13b9198d1f2c1a1da1da7e7d625bf7e80
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs pointing to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the embedded JavaScript.

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 http://4bzsoftware.com/Images_upload/files/gukaguvijalutorajena.pdf In PDF document text
    • http://quaint-house.com/images/blog/file/93062104547.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/13198338547.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/jobuwar.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d52506da---11877026485.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/18990494751.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/wewonowomadodemem.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/pejanipewavekakowe.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/70150235128.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/19258681408.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/15032445335.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/kuwiganomajuworulegu.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/40142373891.pdfIn PDF document text
    • http://moristas.com/userfiles/files/gaxulalovomesukok.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210903_075033.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/33226122166.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b0c5ba08---74102772509.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/38805162017.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/2741267919.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/niropoziwokoberemivami.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/filofanodib.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/93160734615.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-9/20210909192325239908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=nomao+camera+apk+for+androidPDF 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_off0000ae6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6B 16016 bytes
SHA-256: 4e1b4376a597122c34f083ca3a4cfae76ee6228032ea8cc31dc800fcb6c95d17
font_01_sfnt_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 10536 bytes
SHA-256: 1da812c0b5b3d2d12857dd54e5a94e83e8f243f85170211cfdc1cbd6065a4700

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