Malicious PDF — malware analysis report

Static analysis result for SHA-256 127021b8ccb1bdf8…

MALICIOUS

PDF

86.7 KB Created: 2021-10-09 02:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a900d02a79a984875f650b1764b00501 SHA-1: 146ebc3a94c60ff56c902e96ff2956583583b7b7 SHA-256: 127021b8ccb1bdf8fad75cd85f0f9c03dbda7909cd890886cff2a13bf57c0c6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to potentially malicious content, suggesting an intent to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cowichanmusicfestival.com/userfiles/file/93284893210.pdf In PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/zekunimuwatinugivo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136929e3680f---gemupakamaravavazopagib.pdfIn PDF document text
    • http://netflor.pl/upload/File/88698248072.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/12647542816.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/6519799182.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/42561223402.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/dodezewokexok.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/zanaxe.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/damikisu.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/54442506123.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/36186576610.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/87925777862.pdfIn PDF document text
    • https://3redsquares.com/phpsites/vertical_living/uploads/file/48501857648.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/32938642407.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/rapadawavafefu.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/wuraro.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/fowupedawera.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/wixutonuxidedib.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/niwurufokudejedupafow.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/62872103213.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210921095744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=generic+competitive+strategies+examplesPDF 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_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 10924 bytes
SHA-256: f28c1a9c1d25ba28473b9d9bdf095364ae2b6e32f6517c58023875a1aa80c8bd
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 19868 bytes
SHA-256: bd6a9313930a346d1aea037ec8284762695cd280050ee0f5c9bf2d44b88022af
font_02_sfnt_off00013513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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