Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13a48591312d0f3…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 20:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23a2481f309ec3f7ec33b5f393d22f1c SHA-1: ec7a0052c96ed7637f232ebff4733163159ce481 SHA-256: f13a48591312d0f388a28de4b0c895d77371a48344ad52d87957455ae6084830
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • 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://kwiatmetal.pl/userfiles/file/puxini.pdf In PDF document text
    • http://textingrights.com/userfiles/files/bodunanetogekuse.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/71021029031.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/16964342143.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/gukinalajax.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/tapejakomufejipakor.pdfIn PDF document text
    • http://tipiland.net/upload/file/19558070809.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/poferitekidoxebe.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/71352966553.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/wotowovamox.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/nasudimurujikutu.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/22289670580.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/xatosajiregifetikadepe.pdfIn PDF document text
    • http://nova-auto.com/upload/13614924710.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/21847348356.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/laxuwiwunirovifodelipu.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/vulizukufusixenokadugima.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/83562223140.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/texuwigeketa.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210903081224529.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/sisometur.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/vuxujatozapamube.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/jujarokakodesosivaba.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139e89f22329---sulodevavolijevanobika.pdfIn PDF document text
    • https://ibextrail.com/editor-images/makewebasaduzoxelinemu.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/53806516436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=family+guy+quest+for+stuff+hack+apkPDF 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_off0000d22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 17780 bytes
SHA-256: 5db069dff4a5d50c250740ae95b220f7b3dced486ccda5c3a6a0172a6e451312
font_01_sfnt_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 11252 bytes
SHA-256: 2c7adf8d2f08d5fdb4a1187e73dad06b29706b7a78e9ca91c4ebc3b4357861e8
font_02_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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