Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb9df34ad70b16c…

MALICIOUS

PDF

85.9 KB Created: 2021-02-23 04:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06db077debca27bc51e0ee456eaf6407 SHA-1: 1577a3e1673ac7602fd1b663a97733daec849534 SHA-256: 1cb9df34ad70b16ce5ae960299e1b098b96ec75e54598ac37d9d3ef8324abb74
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. No scripts were extracted from this sample.

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
  • 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 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.
  • 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/wb?keyword=what%20is%20your%20philosophy%20of%20life%20essay In PDF document text
    • https://cdn.sqhk.co/nupozifulija/fagjfgj/12894610427.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/eZbjdWw/champion_eleven_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489033/normal_5fdbbd0ab784b.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/2654313.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491437/normal_5fcb09376a240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393179/normal_5ff48c7fc02dd.pdfIn PDF document text
    • https://nonibebufixaz.weebly.com/uploads/1/3/2/6/132682934/1226815.pdfIn PDF document text
    • https://jopovasido.weebly.com/uploads/1/3/4/6/134619877/2f168bd442e53a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5feeee8c51354.pdfIn PDF document text
    • https://jepiweluzobadur.weebly.com/uploads/1/3/5/3/135300479/bunevov-gepumogizitina-sogamurod.pdfIn PDF document text
    • https://sijezivupo.weebly.com/uploads/1/3/1/4/131408567/74245.pdfIn PDF document text
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/8772689.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/dekedubape.pdfIn PDF document text
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/2794997.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/matogapibelifiv/5096510913.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/download_full_quran_with_english_transliteration.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/fekaxaruw.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/fumiduvobasixumafo.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_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 5104 bytes
SHA-256: 59bb053069aaf9c02438f910f763b58846881419b5ccabb01f62d6a544b25f93
font_01_sfnt_off00012675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12675 10556 bytes
SHA-256: ddb0971b46662381ac4c8c3c298ea97f81026580cdf8daca5131c02a35c909c6

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