Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3692871bb81efc…

MALICIOUS

PDF

107.5 KB Created: 2021-02-26 12:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 49b91196577a08373dc5ce257ee52bcf SHA-1: d211ee6c75989abf7d42ca76438c92c995fcd72e SHA-256: 4a3692871bb81efcb17b4639d6891362b1da7ecb4a9ed4c5391d8986c39aedde
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=all+canon+star+wars+books+in+chronological+order In PDF document text
    • http://manamuposa.getenjoyment.net/67905922241.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/fdhcKHj/cbse_board_class_9_english_book_solution.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419645/normal_5ff2aad8d0b4d.pdfIn PDF document text
    • https://nugaridepi.weebly.com/uploads/1/3/4/4/134474671/gorag.pdfIn PDF document text
    • https://cdn.sqhk.co/zatugudaxaji/jhfFgib/bubbles_mobile_dog_grooming.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/geXRhdS/dijumikowopip.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/42889389646.pdfIn PDF document text
    • https://roxunasof.weebly.com/uploads/1/3/4/3/134312726/4699114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_601797ccb97c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480756/normal_5fcecf2784aba.pdfIn PDF document text
    • https://dozowogan.weebly.com/uploads/1/3/4/0/134098910/senaf_nebejawali_bakojinubew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366365/normal_5feb2428ae621.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394072/normal_5fefbcdd34ff5.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/iejcidJ/auto_verkopen_marktplaats_betaling.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379733/normal_5fff9effdc1ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475565/normal_602fff2a7afbc.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/nitizobuv/nifaxekosef.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/71400871732.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/68431247612.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/spore_product_key.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/iptv_windows_10.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_off00016519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16519 5484 bytes
SHA-256: 0d7a344c38811d02a3391b490b17fed491fc01f063660507602f1a1c81686a0e
font_01_sfnt_off000177c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177C5 11792 bytes
SHA-256: 50ffea0c9940678b81aa3ff121fb18da430c839b2948a5a8de899ddd39004dee

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