Malicious PDF — malware analysis report

Static analysis result for SHA-256 616188402952e9b0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 01:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66df06746d6557da5a9414ebee76eb0f SHA-1: d659c06331be450fb73aef836cc1154b15be7d75 SHA-256: 616188402952e9b0ee3dc700875d2981743c61e1b84a2458de923efff904303b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content indicate it's designed to exploit users by directing them to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/rivajero.pdf In PDF document text
    • http://goodwill.pl/userfiles/file/vuxesamefetokazutivinive.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/69341454932.pdfIn PDF document text
    • http://onelove.cz/file/68920194668.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/18087101089.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/47749470065.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/4569259036.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161396b4d08642---8992882438.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/fawekolerujameroz.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/88046368462.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/3mni359nc9rl24199m33kn7mld/jigada.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/6840953464.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/xotiwafazizalobekakudufe.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/76649639441.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/vefemivajoxo.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210908072339.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/3621239878.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613e025d0caa2---99537580513.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/dotupojuwugadesujozonef.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/supafalerer.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907183823489031.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/83769613397.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/sinutevofujutupofog.pdfIn PDF document text
    • http://npas.ru/pic/file/28353785443.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/75878282907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=grand+theft+auto+5+mobile+game+free+download+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_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 11132 bytes
SHA-256: c74ef92159eb7aa261f94b0854d1e5e3b41b54b22deb8f33000cd03028173de0
font_01_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 17120 bytes
SHA-256: d1fc41806e0ad53cfa6d343ec86fcd2b930cb1307be91f46b9afe8ee7756bcc8