Malicious PDF — malware analysis report

Static analysis result for SHA-256 492be6bd64ad4627…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 08:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b952f097b4e3258495433cc047817888 SHA-1: 4e583377ea5f4d1c30adb771203172551804bbb2 SHA-256: 492be6bd64ad462752b21edddb77197f8bbfaaba187942a76bbcc02e0d504ed5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous external URIs, with heuristics indicating it's a link farm on disposable hosting. The PDF's structure and embedded URLs suggest it's intended to redirect users to potentially malicious websites, aligning with phishing or malware distribution tactics.

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 https://oniceh.ru/uplcv?utm_term=android+17+18+lapis+lazuli PDF link annotation
    • http://saga.diamonds/uploads/ckfinder/files/wakutivogizixabum.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/49766041448.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/nixijalojuforozote.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/86576084233.pdfIn PDF document text
    • http://arucax.am/user_images/file/bugulivir.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/17540736459.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/duwamozujejepulilusujona.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/vigulagegatobasajo.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/jutunuribepezopux.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/mupararimazawek.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/fosevuvodemolefa.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/1da470b71582b0bbc9e5add0923acbac/tosasoxofomovuxirunijez.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ce88j1vifvjkhvvm47ljak8mkq/40829257592.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/46526268094.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/8954972172.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/46997991678.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/rubakosegax.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/gekilufisamivoz.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/penejuwaxinowuvawuze.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/43744514820.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/dadof.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/topumevevagemixerizabafa.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/51952287184.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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 18996 bytes
SHA-256: ff3eefd8d03d6aaa18fd3c6f098253df5adfe35f0f3e07c3eed94c243d96d4a1
font_01_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 10604 bytes
SHA-256: 3a062e430ba39a6a515b3f0d802f0d14440dd476863bb1b243ac816042e16eed