Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41b0d52bf668a65…

MALICIOUS

PDF

88.0 KB Created: 2021-04-06 16:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0a7eaee1474797681cecc1d781335511 SHA-1: 21237f7a7271cb1843593134e30d9812f234daed SHA-256: d41b0d52bf668a65126a8239a3ed9f2a8e1ede7fb7b37e8539e07fca8ab1192f
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classification and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to potentially malicious or unwanted content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://zajinet.ru/strik?utm_term=pixma+mx700+prices PDF link annotation
    • https://cdn.sqhk.co/bogovureg/hofjdy2/oliver_twists_mentor_crossword_puzzle.pdfIn PDF document text
    • http://carinsusa.info/kozekudkoi3q.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/7856803.pdfIn PDF document text
    • https://galekogikelubem.weebly.com/uploads/1/3/1/4/131438025/jukunelamekurinisad.pdfIn PDF document text
    • https://wivozodibadire.weebly.com/uploads/1/3/0/7/130775536/65e8f1a84b.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/49844989859.pdfIn PDF document text
    • https://bedaruwi.weebly.com/uploads/1/3/5/3/135326402/sidafapafuji_xinejupema_kexoliv_ziwakakoxole.pdfIn PDF document text
    • http://tegor.xyz/how_to_pass_ap_physics_1_exam81wbt.pdfIn PDF document text
    • http://italywow.pro/33159153156hdy0g.pdfIn PDF document text
    • https://dusalunefawotof.weebly.com/uploads/1/3/4/4/134487283/2014015.pdfIn PDF document text
    • http://pajuwepubawip.sportsontheweb.net/wedoxivalamafele.pdfIn PDF document text
    • https://tefuvaxijo.weebly.com/uploads/1/3/0/7/130739162/najezoru-nefakumopobor.pdfIn PDF document text
    • http://lasleymarkt.ru/2687170900325vkm.pdfIn PDF document text
    • http://tujemet.scienceontheweb.net/us_stock_market_live_video.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/cihgfCa/wunip.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/60f8182bbe.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/estimation_of_evapotranspiration.pdfIn PDF document text
    • http://helpcopyright-service.com/jalikadiruvesabivuruwjtn8c.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/ddjjpja/56220350508.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf414cb-b8ef-4ab6-ad6a-db8c2208c3fc/sipokevuminaralopef.pdfIn PDF document text
    • http://gitodake.myartsonline.com/dieta_cetogenica_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db382bb-1c19-4980-b31b-6690f213df92/55045959212.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_off00011149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 5336 bytes
SHA-256: a6c5d8275833578ef573e645546b722d1ec553ad02ed0cfe120f92601102ae8b
font_01_sfnt_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 15212 bytes
SHA-256: 75709cfe5c5144a8d1a50016c42f074c06b712ce3d3b19e845144fdba01b22d1