Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dead5127f7b368…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 00:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17d6fa0bc96916138d9208153c91400b SHA-1: a15d8f040e0e2ecb780c3d7103a98492584e2117 SHA-256: 05dead5127f7b3685d8f3e52dc80460aed0576f137507974186150bf0e36fa53
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically identified as a random URL on a disposable hosting domain, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://biomedchita.ru/imeg_master/file/98088755330.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613540d226835---20881799332.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/botulufu.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/25036804167.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/38602793803.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/patesiwexajibiwopifa.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/27146811363.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/sewabuk.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/38716153205.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/1646146452.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/wuwugaxovapufize.pdfIn PDF document text
    • https://profesa.net/userFilesfile/nobetalaselamogotud.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/30786886518.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/robomiwimof.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/78679153303.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/wonad.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/dozepoxasuxub.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/23187594801.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///zeferanevilaruzulopubed.pdfIn PDF document text
    • http://airzo.net/userData/board/file/fofelomezozopuwubaxo.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/pikinujemuburu.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/93532731857.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/damat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+studio+fontPDF 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_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 10088 bytes
SHA-256: 501cb6514ddd18cafd8dc477989bad5bc5db9353ff6e0806ac90af37d44d3552
font_01_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 19336 bytes
SHA-256: 3eff550b8d26753c77f697f24ab16f6722a895ac5fb8c101d5b43a79f68b17c4