Malicious PDF — malware analysis report

Static analysis result for SHA-256 4172fbd4259a1dba…

MALICIOUS

PDF

75.5 KB Created: 2021-02-07 05:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f36704c290b5110d6da5e2da76a010b9 SHA-1: f32ec993408c80ffd17f1db008e75d7ed98cfe73 SHA-256: 4172fbd4259a1dba32d30f58998d4950cce1f3070cb02eac159b312a51274ae4
134 Risk Score

Malware Insights

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

The PDF contains obfuscated text and multiple embedded URLs, many of which point to disposable domains and are part of a link farm. The heuristic 'SE_INVOICE_LURE' indicates the document attempts to impersonate an invoice or payment notification to trick the user. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/wb?keyword=goods%20receipt%20invoice%20receipt%20report%20sap PDF link annotation
    • http://lasns.fun/69500762291f5vbc.pdfIn PDF document text
    • http://4escam-bot.online/62257999319rh5uw.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/j0Gjijj/nhl_hockey_fights_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_601f1eec6c664.pdfIn PDF document text
    • http://komarovskii.xyz/36867791947x0af9.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/2466331.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/iVidSic/tor_browser_mac_download.pdfIn PDF document text
    • http://rusherx.studio/tujovagawuwoxubakeems9j.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/dXgFigj/play_store_free_video_calls_and_chat.pdfIn PDF document text
    • http://zootime.store/wujibogomakesoligamufa9yx5h.pdfIn PDF document text
    • http://natiral.space/nails_done_hair_done_like_a_savagezrms3.pdfIn PDF document text
    • http://linza.media/buwidufag6rktp.pdfIn PDF document text
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/verabilelamotibubi.pdfIn PDF document text
    • https://zagiwesojuju.weebly.com/uploads/1/3/2/7/132712322/gakozoto_sapumoziseguder_lerudipewoxe_dufadibo.pdfIn PDF document text
    • https://tulidakavixesa.weebly.com/uploads/1/3/5/3/135347336/nasorefubi_setomofefetir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503791/normal_5ff069db42cb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd1902ac9770.pdfIn PDF document text
    • http://afracheat6.xyz/cisco_ws-c2960x-24td-l_datasheetwqn93.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/jiChfs8/nemiwodoneburi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wozowuledij/6161074149.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/sawudu.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/50762119012.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 4912 bytes
SHA-256: c9df7ac107d8046d14e57c33a453e2ba325f26b9a118b6fe7bc0743dd0afce3f
font_01_sfnt_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 10400 bytes
SHA-256: 7b5089bbca351d88263b1dde0c93e276df0fb0028a27e77a6391e973253fd884
font_02_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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