Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab695475c22d2f1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 17:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 998c017c2b2f209b9bbee3aa5bc77304 SHA-1: f4bc03537316eb96a15ca44cadde3f4cb837d7ee SHA-256: 3ab695475c22d2f1daa98f2fa1519f0ab9ad78bd2d3b40511ed2a305f7ba2c1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to other PDF files hosted on potentially disposable domains, suggesting a link farm or redirection scheme. One URL, in particular, is identified as a link farm with a 'utm_term_redirector=True' parameter, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://manpukuorder.com/uploads/files/zetozat.pdf In PDF document text
    • https://saigonservices.vn/images/uploads/files/pebupunufep.pdfIn PDF document text
    • https://soechi.net/userfiles/file/kulepixuzutataki.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/sapote.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/94874084394.pdfIn PDF document text
    • https://redac.ch/upload/gopapikumudebisuses.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/41843909360.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/78681765454.pdfIn PDF document text
    • http://dsfly.com/uploads/files/63405891015.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/wuwawemoxibekatejev.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/58840688983.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/vevugenipezu.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/42126381076.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/97485535619.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/84571259850.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/zixarezirevo.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/28362289365.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/wererabagarururuziz.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/49049673344.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/29252034283.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/kunagijewum.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/vetiki.pdfIn PDF document text
    • https://norservis.com/files/files/fobobivelofuk.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/pukovepebikosu.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/36990162929.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/33184910413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+whatsapp+latest+version+2020+apk+freePDF 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_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 18408 bytes
SHA-256: 9e129f30603288997bd57f6cf0bf0b0c34d6970f93f8ff82fb2212b37fc4231e
font_02_sfnt_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 11080 bytes
SHA-256: 773e4fd6495d22757d1e7103d280b1f4fb2150675fe137f29105eb7e940dd7a2