Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1729a3f0f061556…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 09:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0917299d079271267645ac2652916f6 SHA-1: b648b03e0eaff3be7c1e4bc94a6e1e15f6620992 SHA-256: f1729a3f0f061556f01059a7ba312ac840dea1b663c088e8fe818c1fe991df36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to disposable hosting sites, with one prominent URL pointing to a GTA 5 mobile APK download lure. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://queure.ru/uplcv?utm_term=gta+5+mobile+apk+free+download+for+android+without+verification
    • http://b40555.handyfriendship.com/upload/files/66207531506.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d794c3499---80889165626.pdf
    • http://www.pics4us.de/userfiles/file/65254302466.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/siwofotedik.pdf
    • http://fourfoods.com/images/files/4062733858.pdf
    • https://globalcircle.club/userfiles/file/34811752249.pdf
    • http://vinhthuan.com/upload/files/19338586771.pdf
    • https://otoform.com/upload/ckfinder/files/38300098213.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/73088485331.pdf
    • http://isotope3.pm-ural.com/uploads/files/35586468036.pdf
    • https://limblength-sldf.com/userfiles/file/nululawurirodafalogabiso.pdf
    • http://www.europesolidaire.eu/userfiles/files/43597362604.pdf
    • http://otvorene-srdce.sk/userfiles/file/90674203129.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/9520c149d95b9b31effa171df07d0636/48665550675.pdf
    • http://tunglamgarden.com/images/fck/file/jikukikuwixosisuke.pdf
    • http://peak-experience-japan.com/images/blog/file/luvoleledaradejuluvev.pdf
    • http://oldadmin.k12cart.com/media/files/92886055825.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/77940408708.pdf
    • https://wangwangcamp.com/uploads/files/202109090857142823.pdf
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/56859619776.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/49792053551.pdf
    • http://geometracosentino.com/userfiles/files/75071244877.pdf
    • http://www.gulbaharsigorta.com/contentData/file/27115165095.pdf
    • http://fosterfreezesantarosa.com/uploads/files/juxezeluf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aed1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAED1 16792 bytes
font_01_sfnt_off0000c6e8.bin
b89ce096af30f44552539f439107364b452cc0456dda8b95bae3d76eebbe67d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 11372 bytes
font_02_sfnt_off0000e160.bin
ed00646b72f33945f4ff60ab54d783bc21c7186a92ad881241ee38c824a1cb17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 16272 bytes

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