Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf0fec535f8b233…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 09:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e482e03cfe117aacedd93dd3e787ffd SHA-1: 1de4b60e66b4b7aa267b7e199db699c744eaee25 SHA-256: cdf0fec535f8b233bb1d67286731d4b9a4a26adcd22a16b53c3c0a587b910498
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many of which point to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the execution of further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://adance0112.com/upfile/editor/file/66623816711.pdf In PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/domijaxebefujowerogipixo.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/nepowutifodafojufam.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/65332195564.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/pifesofuxoba.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/92665092211.pdfIn PDF document text
    • https://petala.gr/userfiles/file/mifidaxadaxogoxopu.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/63882762684.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/xilegupafebijojiremomuj.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/50548766052.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/baguniporegezoja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331f35e39df---55268293679.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/17690464691.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/76898601244.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/lobusiluwasujezazalo.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/34608966413.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/gukun.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/40880202319.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/92786969950.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///7888677995.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/67188609646.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/41876665822.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/famajuluvawudinokawotog.pdfIn PDF document text
    • http://bastola.org/userfiles/file/8850289733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pk+xd+mod+apk+unlimited+money+android+1PDF 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_off0000c7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 10844 bytes
SHA-256: 44320ea530fac5428774ad250c09fde697e50a0e2607743c2fd47dec23cf1564
font_01_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 18648 bytes
SHA-256: 03b1a474f0caf69dad730407e2970ea63c00f554d3a5a8a45a3d04311c3f4ba4
font_02_sfnt_off000110c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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