Malicious PDF — malware analysis report

Static analysis result for SHA-256 0367addef93545d6…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 12:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b03fa55fd274343ff9d11443bd33c156 SHA-1: bcd81ea7069d1e37805571ba89d81fa4ae1eefcc SHA-256: 0367addef93545d6b79cc08896fa05f4fe3e933611b979f931a47a21dc8578ae
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 variant. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination or purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://angel-juicer.com/FileData/ckfinder/files/20210908_4407E33F2C718352.pdf In PDF document text
    • http://sino-web.net/filespath/files/20210901152811.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///52132504564.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/54977602756.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/butowagavaronimibogavolu.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/jowewonetosipirajevil.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/98028118201.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/wanamejuwaze.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/paxelidolil.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/lexugixusolabufagi.pdfIn PDF document text
    • https://clinicscrm.com/img/files/75570520851.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/tapel.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/vexaw.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/texokegetibigivi.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/26989090742.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/96719469752.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/demebije.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/31152741724.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/zuwuvafifixemosixulifexis.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/semurixipefuta.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/34151996235.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/mosusasos.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/88807797858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=vpn+super+unlimited+proxy+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_off0000baae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C0 16632 bytes
SHA-256: 37462e348eadcedf0ac5d92344d47dd57f49a5655fae1b91570e02ef89c14ba5
font_02_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 10944 bytes
SHA-256: 74575d61d066eb13753ab6269abb47fcc5b8555f7f77b3c2d42ac5c6167f6670