Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ce5f2d87c107e0…

MALICIOUS

PDF

91.1 KB Created: 2021-09-19 07:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df57ef12e2a58b2724b6ccef5e50d8fe SHA-1: 4cd02e94e5a0ca2b741bba1717044c802222d207 SHA-256: 26ce5f2d87c107e0c45e9c041104ff8e164c48ee4a301233da85e9c52809747f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a notable one pointing to 'inwebjor.ru' which appears to be a redirector for malicious content, likely related to software cracking lures. The PDF's structure suggests it's designed to host a large number of links, characteristic of a link farm used to distribute malicious payloads or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=adobe+photoshop+2015+crack PDF link annotation
    • https://worldcastlive.com/userfiles/file/36341386083.pdfIn PDF document text
    • https://taperagi.com/contents/files/bexodon.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161412a74daea5---kilovupejikezuvareguxew.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/jaluzevi.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/vavagosiroxebenujixogez.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/22429246968.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/xixezariseje.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/zopezi.pdfIn PDF document text
    • http://glassick.com/userfiles/file/4678011080.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/faxazarebilozome.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/92069326917.pdfIn PDF document text
    • http://staropolski.net/Upload/file/89389921192.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/73251772934.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/milafobimujuro.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/2509668599.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/mudupemorekefogugowepu.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/46509503445.pdfIn PDF document text
    • http://haphadoor.com/upload/files/26929628659.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/xojebusemig.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/nubemobutulodemazaro.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/44942468394.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/gadubutafixawirodiked.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/gusunifemamelarosezeg.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210915/16316903526060.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_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F6 18496 bytes
SHA-256: c973d5f044d7b63113b31a98d3ede9a2c9ee729318d0c7b623e7b558dfdb73ee
font_02_sfnt_off000144c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C5 11008 bytes
SHA-256: 3f0570077acc0ff02f0675bd39e8f3425d057d3c46740f196e53787c2bac3684