Malicious PDF — malware analysis report

Static analysis result for SHA-256 79114c5e44b39385…

MALICIOUS

PDF

75.7 KB Created: 2021-09-11 04:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a194fd859608d1d44274262428004382 SHA-1: 9f6280725d119772979c4fb7fbbbefdbd1696dab SHA-256: 79114c5e44b39385c654906dc8eb0ded0f214d8b2e39a53644449c0994dd380f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. One prominent URL, https://coretry.ru/uplcv?utm_term=kinemaster+pc+download+free, suggests a lure related to software downloads. The PDF structure and embedded links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=kinemaster+pc+download+free PDF link annotation
    • https://anthonygillant.com/userfiles/file/ribupuwomojinodaf.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/renesokebegoxoma.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/72873928957.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/2783256372.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/muluvidegivunafumiveg.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/25950062154.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zidavasobav.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/87556591852.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/sazutukaxula.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/54723659591.pdfIn PDF document text
    • http://smirna.pl/files/file/10907312750.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/pojuzalutoponowejaziv.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/93476048305.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/70126222226.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/72438297859.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/kirupu.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/51105986680.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/72658818434.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03f2d4d52---tatamigepifodimebi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zakifezufezenakozesovij.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/60141308221.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/gejuvexax.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/6389955099.pdfIn PDF document text
    • https://geniodelweb.com/file/5490326801.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161365a2cbe0ca---kizufodozevo.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_off0000c51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51B 16604 bytes
SHA-256: ee4d553df772227e76ab124e721a2502f2aba7b06f3e5b28d5a1748f72851be5
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 10860 bytes
SHA-256: 5edd589b34bd3de6ec65d967136ffdf618ff840c1a63d03b628a31ffe4d1d62b
font_02_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1