Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2d70a9ebd9a60e…

MALICIOUS

PDF

92.1 KB Created: 2021-04-24 04:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e317f799e372bce7a24fe033ed08100b SHA-1: 9505a5e371e9dba797ecdb7e615f34e6b267e394 SHA-256: cb2d70a9ebd9a60e8768cb4f9315ee914a4f996e682bb328853cefbe75444b16
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farms or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to distribute further malware or engage in phishing. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://zajinet.ru/strik?utm_term=how+to+write+machine+learning+algorithms+from+scratch PDF link annotation
    • http://juvizex.sportsontheweb.net/what_kind_of_memory_card_does_the_canon_powershot_use.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/4jergeu/wedding_salon_2_download.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/alternity_starcraft_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/tusadopovet/PjaQqgd/32480114023.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/egih0jf/hotel_panorama_panichishte.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/id3giYg/classic_hits_radio_near_me.pdfIn PDF document text
    • http://pezejij.mygamesonline.org/english_worship_songs_lyrics.pdfIn PDF document text
    • http://poruzotosiku.getenjoyment.net/celebrity_endorsements_a_literature_review_and_research_agenda.pdfIn PDF document text
    • https://cdn.sqhk.co/nurafurofopu/hiwggpw/electricity_and_water_services.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/tuxajimaxifabivezi.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_3051e01680ab4e1099fadc1e45e80086.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/wuvaratowumigizaniv.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_47d3dbff0d044a128ca56f205c3e1402.pdf?index=trueIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_adc7bbd09f5b4cf9864102aeb8603138.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/50235447763.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_159bfe20f1d445548f24484da3139096.pdf?index=trueIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_f0079bd41ad94af28223f8e3a770441a.pdf?index=trueIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_f6cf7a199bcb444681aeaa9cd3673e0b.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_e7f9b77686f94d288e78e64c10f0d12f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisi/57654327126.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/34721420773.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_45746ea449c446e09da0904140189324.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 5136 bytes
SHA-256: 78fbb3e619fa95ec7a5e502697d3b9cc3d9b8d6ddafab48082f29074739adff5
font_01_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 10624 bytes
SHA-256: 2a15c8bc8395aff2ad29d4fbb17304426f7c588f0e11eb3d7b2cac473e97d5d9
font_02_sfnt_off00013ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED4 16176 bytes
SHA-256: b34bc647a855ee836f1f15d23d07ef8fc86c66da9663e0d441a972b7f835d709
font_03_sfnt_off000153ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153EA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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