Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb55eb139b226a0…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 11:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c36190a979ace622809c844900f02ce9 SHA-1: 577ee6cd68a5e558af449ae97056cd53c50505b1 SHA-256: fdb55eb139b226a09ea1c68fd18271da7a4a1faafd21fc4e22bcfff38944d328
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=tubemate+youtube+downloader+2020 PDF link annotation
    • https://blokhol.com/upload/files/lalurojipodirozazinotu.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109151452045623.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614722fceedea---kojitigobar.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///wemabofofaxujejafidotow.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/87896508691.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/genugadosagudelevo.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/1000861410.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/63507803750.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/mezozovap.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/tupuzinuvobixapurugaxom.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/wozoberijoferagiruxole.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/95986705902.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/xatopajawujexupeg.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/pevetediwewe.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/foniniduzifesugapudirod.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/monax.pdfIn PDF document text
    • https://www.znackakvality.info/files/92856453036.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/59974516327.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/betuji.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/24990629416.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210920145755.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/90548453770.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/6a08c7c79ddcbcc631e75db3090a1b1c/votaratanemopimetikok.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/86934788969.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/63413629811.pdfIn PDF document text
    • 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_off0000b1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EB 16616 bytes
SHA-256: 9050d28bba560ce4ee30a043f402ee01c2a28ee8bbd203f71fac97b503f37c29
font_01_sfnt_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 10796 bytes
SHA-256: 36857ae19a756d00ddf75f541fd4c1062dc10d7662db19cbe3fd1e44d33892b0
font_02_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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