Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed8dc5bc2d25f02…

MALICIOUS

PDF

92.2 KB Created: 2021-09-18 03:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d26f30b9405a4eb07aa914df62aee57c SHA-1: 616f37622987082bf1dc3283fcf376e4a3ff20ad SHA-256: 1ed8dc5bc2d25f0200281467376c8a4279554fbb0c9fe32610c36af11ebb5d4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with a high heuristic score indicating it functions as a link farm on disposable hosting. The embedded URLs, such as http://dokturmice.com/ckfinder/userfiles/files/mumofovugutugatig.pdf, are likely part of a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dokturmice.com/ckfinder/userfiles/files/mumofovugutugatig.pdf In PDF document text
    • http://antonioruizabogados.es/userfiles/file/61269420048.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/71955174363.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/jonovezotobelukenejadekuv.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/2155053893.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/narinikax.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/dakivalinerefulotojiv.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/kometugufiwukogedupadaj.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/rofujawopurir.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/mosizemoxevovugudero.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/luxagojagaminewazi.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109102358435075.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/fosamevaderunasajisu.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/63361635980.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/wivopexedefomiwatufelu.pdfIn PDF document text
    • https://superchills.com/userfiles/file/noxivebiwanid.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/zipawozisasiwomejutegez.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614143f7068e2---46317735413.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210903000239_24520735.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/82167520252.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/dawizesib.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/zitoxifivagugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=heroes+of+the+stormPDF 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_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC3 18456 bytes
SHA-256: 99cc237ade87f4177560b4d79a48cc86b96deb79dcf1b06d53869bb3ce22d7da
font_02_sfnt_off00014d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D28 10064 bytes
SHA-256: 2237d7502640f47de90f9ec908f08f67730720c01b8d37a6e72cea5993763e4f

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