Malicious PDF — malware analysis report

Static analysis result for SHA-256 942f65042ade044f…

MALICIOUS

PDF

73.8 KB Created: 2021-03-17 02:11:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6aaef871ea756caeaf6d598a25e84a1b SHA-1: 28c7ff34e854ea904a41c51a95eb27cf79d45343 SHA-256: 942f65042ade044f3a646bc4e158c64e7461aa50848a1879a8cf0a72a66b4697
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, some pointing to potentially malicious domains, suggests an attempt to redirect the user to download further content. The 'SE_DOWNLOAD_BUTTON' heuristic indicates a deceptive call-to-action within the document, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=silver+age+sentinels+d20+download+free PDF link annotation
    • http://fartook.online/ukulele_fretboard_notesgmlne.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/english_grammar_worksheets_for_class_10_cbse_with_answers_2020rz5gw.pdfIn PDF document text
    • http://natgood.space/hitman_sniper_gameplay2z1es.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464732/normal_604465c60b904.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453741/normal_5fff1151ce493.pdfIn PDF document text
    • http://beamorem.com/tageforabupaleruxowavimitaut2j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_600bac06e82a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_5fe8021d789f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_60135d1a5dbdf.pdfIn PDF document text
    • http://prod-fruit.space/774405020s7dmv.pdfIn PDF document text
    • http://artelamp.store/busqueda_de_informacion_en_internetd1xi7.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/wovugesovutirawiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_60354ce97175d.pdfIn PDF document text
    • http://goromeo.club/zegimevofunewobevufilt08e.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/mesixadelomomo/chicago_cubs_schedule.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/kolabozabefub.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/jiwopufusagaregepizare.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/goxosufejozewojorepoju.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/xunuwu.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_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 5604 bytes
SHA-256: 4551e2731b17cab084acfa9ef323ddf38d67ee9a0700fbb66bd5464d71af27ed
font_01_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 11148 bytes
SHA-256: c0bcccb120120cd39ec917a58bdb2f94c587b63aaf021112a70ce00cfa2cc013

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