Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb9310242fa3787…

MALICIOUS

PDF

76.9 KB Created: 2021-03-16 09:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95998c606cb4b372fbc781d9121d3d55 SHA-1: 79f262f719d4c4eb4b83fde3b2c499edfec64cf5 SHA-256: ceb9310242fa37879f28b9d28cc556f026e690a4c1a6d698228c078934e8d391
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection by ClamAV and an ML classifier. It contains a large number of external links, with a specific heuristic identifying a 'link farm' and another highlighting an invisible link to a suspicious domain. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of numerous external links suggests an attempt to redirect users to potentially harmful websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://druttle.ru/strik?utm_term=how+do+i+reload+my+verizon+ellipsis+jetpack
    • http://flipping-car.online/850033469954k3a7.pdf
    • https://pusugokejetajek.weebly.com/uploads/1/3/4/7/134765622/gulopijevirelen-vameripifixuvo-jifisawopiji-movuxelose.pdf
    • https://butilitari.weebly.com/uploads/1/3/3/9/133997497/2477894.pdf
    • http://dombitarf.ru/58781734661fg1h8.pdf
    • https://cdn-cms.f-static.net/uploads/4424689/normal_600a947253df2.pdf
    • https://static.s123-cdn-static.com/uploads/4480736/normal_5fef89762f72c.pdf
    • https://cdn-cms.f-static.net/uploads/4489412/normal_604f08b83b208.pdf
    • https://cdn-cms.f-static.net/uploads/4427077/normal_60100c5664a41.pdf
    • http://ergors.space/pavukekox7oh1.pdf
    • https://kasitawudak.weebly.com/uploads/1/3/1/3/131380619/zarab.pdf
    • http://emirofficialzm.com/233045093840mu9p.pdf
    • http://com-login8.xyz/irumudi_kattu_sabarimalaikku_tamiluz61l.pdf
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/muvulivero-jezem-ketevapopexeja-giwoxirudatu.pdf
    • http://merovew.xyz/644337921929mc0i.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wuniku/11759812348.pdf
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_9ce93cda98a24e2c9f01325d4c22e365.pdf?index=true
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_f1fbb0b3a3f549308e44b94aca41d42e.pdf?index=true
    • https://s3.amazonaws.com/lovomijelun/why_do_students_hate_school_uniforms.pdf
    • https://s3.amazonaws.com/vovopafubipu/learn_spanish_book.pdf
    • https://s3.amazonaws.com/nevowimo/85098964113.pdf
    • https://s3.amazonaws.com/sefiwegegagu/66339638817.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec69.bin
15715999a11301c6d570be29d77c9df447f0c9c07c3213f3142698fd867c931e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 5624 bytes
font_01_sfnt_off0000ff98.bin
4a66bb8cadad88b3791a78c6b9e3f8e30c79008a1deb4ea1ddfe529f05285544		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 11216 bytes

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