Malicious PDF — malware analysis report

Static analysis result for SHA-256 46eef89826de8f35…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 11:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b25e7dc9581cd1dd0c492f166995fda SHA-1: 513f2c3231de66f50f9edfa734248b4f0213e7af SHA-256: 46eef89826de8f3526e0a80b0e1cf141ee2e87d2f11bb74d3bf31b5c9bc9e0e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple external URIs were extracted, pointing to various PDF files hosted on different domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://anhbanglaw.com/userfiles/file/xaselorarozutopokuwived.pdf In PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/josopop.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/31901250510.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/56717441356.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/82800022222.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/timopukubup.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/94476153017.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/watadoti.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/32353548683.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/muloxe.pdfIn PDF document text
    • http://p-energo.ru/content/file/73628305900.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/burajuba.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/43338727686.pdfIn PDF document text
    • http://elma1.ru/!upload/files/futozefovejukowosel.pdfIn PDF document text
    • http://muszempilla.com/files/file/91921409173.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/25245020202.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/18144949917.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/buziberokivofupap.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/38482287490.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/foxolejawolomoji.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc305d7687---jarisewima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gta+v+car+codes+pcPDF link annotation
    • https://b2cdemo.tickets.com/content/files/3282691109.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_off0000ac61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC61 10368 bytes
SHA-256: 13742c7233e5149c178e4336e6c84c692c07c4398a321138d383e6b181d56376
font_01_sfnt_off0000c400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 15808 bytes
SHA-256: 09fd6a11515909882ec9b436611a90ee51a842103e4c1e5c7a0d02018328b783