Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c3727475233bbb…

MALICIOUS

PDF

79.3 KB Created: 2021-02-15 18:59:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: bd8c8bcdf9f550e1a599674dd6d00135 SHA-1: 7fe5731611e949f9811003e203114ad338ba2770 SHA-256: e2c3727475233bbb259c41cfe9abefc37d0e2bfa8058b3e0f9400ed2778c3aec
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identifying it as a phishing or redirector link. The embedded links, such as 'https://yafferge.ru/strik?utm_term=the+quran+in+english+audio', point to known malicious infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of numerous links to disposable hosting further supports the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=the+quran+in+english+audio In PDF document text
    • http://puwisagoki.22web.org/last_week_weather_report_in_bangalore.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/9465501.pdfIn PDF document text
    • http://vuzisebepuda.iblogger.org/81237312129.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464720/normal_5ffae4cf2a14e.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/c582299a9faf8f.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/1726340.pdfIn PDF document text
    • https://damanula.weebly.com/uploads/1/3/1/8/131856109/matozir_lenatagatonevun_jazulagusonavi_girufeguseki.pdfIn PDF document text
    • https://fitarerak.weebly.com/uploads/1/3/5/3/135313257/tabujizike.pdfIn PDF document text
    • http://pevojatinolotej.22web.org/87116930738.pdfIn PDF document text
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/lepixapij_muvamazefopanuk_sedenebadup_pelozesofas.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/dumupa/povavavonabirugub.pdfIn PDF document text
    • http://xelidamos.epizy.com/dads_worksheets_sudoku.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/zazanibuxot.pdfIn PDF document text
    • http://jofesosozofoso.epizy.com/2014_audi_q5_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/clear_google_app_search_history_android.pdfIn PDF document text
    • http://kexabomatifub.epizy.com/tg20_compliance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/bolbona_go_song.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2B 5164 bytes
SHA-256: f44add49226c45ece2a0a8349d5646533e38c761dccc896b30ea8b8a7720ddc9
font_01_sfnt_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 10796 bytes
SHA-256: e650ce2fba68d2e2981247969693c3c623364a0fcd1f4d8355816c78e21d775b
font_02_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 24084 bytes
SHA-256: 337006e0a943e0367f5cf175627fcd73f486c0613bcb182b22039b380074e5aa

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