Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7db6bb9f09a2173…

MALICIOUS

PDF

74.4 KB Created: 2021-02-23 06:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c7e901da938f540924560d9e6272c0b SHA-1: 22681b88effdf85d90a040a63f59939746653a2b SHA-256: a7db6bb9f09a2173bae1d1cab90d2d8c25e55b7c29ce8b193b9b4777163fd224
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. One of the primary URLs, 'https://maypoin.ru/wix?keyword=hack+kingdom+hearts+unchained+x', appears to be a lure, possibly for phishing or a scam, by presenting a search result for a game. No scripts were extracted, but the extensive link farm and the nature of the primary URL strongly suggest a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=hack+kingdom+hearts+unchained+x
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5ff9febb51d70.pdf
    • https://static.s123-cdn-static.com/uploads/4383792/normal_6000467728e73.pdf
    • https://cdn-cms.f-static.net/uploads/4369158/normal_6014f959f20b0.pdf
    • https://static.s123-cdn-static.com/uploads/4481067/normal_5fddd326c9201.pdf
    • https://fevokixesebu.weebly.com/uploads/1/3/0/7/130776230/najebugat.pdf
    • https://cdn.sqhk.co/refowofiros/YkzSjep/gudinarululamajabenevit.pdf
    • https://cdn-cms.f-static.net/uploads/4501482/normal_6025fe2deb64e.pdf
    • https://feverawujebuv.weebly.com/uploads/1/3/5/3/135314909/sirelakatufari_paduwekovo_dotitepojaxo.pdf
    • https://cdn.sqhk.co/wefadegese/ahicjiZ/32005914577.pdf
    • https://static.s123-cdn-static.com/uploads/4415326/normal_5ff8f6066e770.pdf
    • https://cdn-cms.f-static.net/uploads/4454684/normal_602367f91e52d.pdf
    • https://vepenisa.weebly.com/uploads/1/3/4/3/134339982/jofabim-viwitu-vudone.pdf
    • https://cdn-cms.f-static.net/uploads/4411696/normal_60343590c1ed0.pdf
    • https://rugadugunat.weebly.com/uploads/1/3/1/6/131606951/kajixaro_tukerojefegaziv.pdf
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/4172329.pdf
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/jizuxemi.pdf
    • https://cdn.sqhk.co/perokokamosa/hjiN5gc/crashing_season_3_episode_4.pdf
    • https://dutagoloz.weebly.com/uploads/1/3/0/8/130814416/wabojugadikagoju.pdf
    • https://cdn.sqhk.co/jidulopavoji/hahhuIm/bazekaruxidiwupe.pdf
    • https://kubazavazagemu.weebly.com/uploads/1/3/4/4/134464578/4948708.pdf
    • https://cdn-cms.f-static.net/uploads/4403283/normal_6031d28d1a2a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e529.bin
b3ef8104e529c807b330252a18fef897bf0f9f44ffc7154c383303bfad1b5a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 5416 bytes
font_01_sfnt_off0000f76b.bin
a42d2195081aba19dbe52a28ebaddaa942e367550ca56131fc24dd6ecc6cebb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 10752 bytes

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