Malicious PDF — malware analysis report

Static analysis result for SHA-256 de921f7a07bb4f8c…

MALICIOUS

PDF

74.1 KB Created: 2021-04-06 17:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c47b03b9cf3eb4253fe41bf5c08940be SHA-1: 262b57da5193c19756a47d073a2b4cf3639eb8e7 SHA-256: de921f7a07bb4f8c8d37c9deccfb6b983cd4976beaabf6bc6f76f122a75f1129
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/123?utm_term=the+weather+report+band PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481164/normal_60661ea5b7e00.pdfIn PDF document text
    • https://xavabijikuz.weebly.com/uploads/1/3/1/6/131636819/4533267.pdfIn PDF document text
    • https://kizerovum.weebly.com/uploads/1/3/4/7/134747257/viruzukasewivimaneg.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/Qibijgg/lowercase_g_worksheet.pdfIn PDF document text
    • http://ratapadeko.22web.org/peerless_2300_transaxle_parts_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/gfJgdij/4060668355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fdafd2f878b1.pdfIn PDF document text
    • https://nodefosodetapa.weebly.com/uploads/1/3/5/9/135978328/vejugepitojonavuzep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_603d3d77ebf89.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/TjiTnig/telegram_desktop_voice_call.pdfIn PDF document text
    • https://cdn.sqhk.co/sisamide/wQChgjj/93786589437.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464068/normal_5feb012a11712.pdfIn PDF document text
    • https://ronojunigamedez.weebly.com/uploads/1/3/5/2/135297775/ce4324.pdfIn PDF document text
    • https://cdn.sqhk.co/jowepotoxum/ibheTie/xijevutef.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/KDhjifI/bts_real_piano_tiles_game_online.pdfIn PDF document text
    • https://kotemuzever.weebly.com/uploads/1/3/4/8/134884044/xunodujonabaniduje.pdfIn PDF document text
    • https://cdn.sqhk.co/penavagalo/SXUAih6/56404844330.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/wozutafojavowizuba.pdfIn PDF document text
    • http://kewonor.epizy.com/yodha_arjun_pandit_bhojpuri_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/autodesk_inventor_free_trial.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/madojirejipovezojixeled.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/avidemux_free_full_version_64-_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/30200275212.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 5016 bytes
SHA-256: db68c85261e6690c47fd7fea1d3b5fe815950bf63a4c4774385142acaedf8508
font_01_sfnt_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 11040 bytes
SHA-256: cc7abc6197ffaaa5eba976b10fa2ab88e63e27b09d63af65502d92fc8d8f3839

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