Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afc90e70dd27576…

MALICIOUS

PDF

81.2 KB Created: 2021-03-19 12:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 942c92208554ca66bb9c4d1b35574ae2 SHA-1: 80070211fc2654fdea51659562b894e2148db170 SHA-256: 9afc90e70dd27576c6981a436fcfc24749d85a1d39b94e92215dac90731fc468
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=aleph+paulo+coelho+pdf+francais
    • https://davijonixumitu.weebly.com/uploads/1/3/5/3/135349017/ramese-wakevadam-sujorajejo-zikimumodozab.pdf
    • http://rekijiwowak.scienceontheweb.net/hermle_340-020a_speed_adjustment.pdf
    • http://bikelumonekodex.mygamesonline.org/mdcat_2020_download.pdf
    • http://geosen.net/the_hitchhikers_guide_to_the_galaxy_2005_hindi_dubbed_movie_watch_online0cnvy.pdf
    • http://reflectionss.space/437805671288cnba.pdf
    • https://cdn.sqhk.co/vuwonesi/ygiMhbb/rigezekut.pdf
    • https://valabokewem.weebly.com/uploads/1/3/5/3/135311070/xoxotolexifaj.pdf
    • https://cdn.sqhk.co/kupejabel/dgejaH6/my_talking_tom_2_download_apk_android.pdf
    • https://cdn.sqhk.co/tisojubew/t5lid2V/tufifiluwigaregofezejonu.pdf
    • http://ulekschool.online/letepinudevepazx91bc.pdf
    • https://cdn.sqhk.co/bufomofa/hdie1Qp/absence_notice_template.pdf
    • http://sewatumafuta.medianewsonline.com/baudrillard_simulacra_simulation.pdf
    • http://generalmassage.online/bitter_gourd_images_freeo4sv4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_fbb407c4583e4473a2b5466e55b9f333.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9003b987-8fe6-4ce2-9c56-5affac51626f/42910822650.pdf
    • https://uploads.strikinglycdn.com/files/92c7322a-8f92-4754-952f-b7827aced4c2/30611659634.pdf
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_d6200dc98f5243f896d371ff999e0142.pdf?index=true
    • https://uploads.strikinglycdn.com/files/318ff36b-ff0c-401a-9548-8ac43a0f801d/intermediate_english_conversation_lessons.pdf
    • https://uploads.strikinglycdn.com/files/b770cf45-510d-4090-9161-42af87f28689/23425608616.pdf
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_4bd132efe75d4404bdee3beba799dbdf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7156de06-a695-4409-914f-809d085c72e9/estudio_del_trabajo_roberto_garcia_criollo.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_off0000fd2f.bin
af83fe88103ee25478abfdde92e080d5be6f3081476c5954bfc42705d734da1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 5232 bytes
font_01_sfnt_off00010ef6.bin
4269fea1390282a2ab1b89e2eee7cf4edb2f7ad29f23965e7297664f074323c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 12216 bytes

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