Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6fb21d1def5d92…

MALICIOUS

PDF

82.0 KB Created: 2021-03-25 04:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e258f51310360af1876c4e3d81ca877 SHA-1: 1a02bed8c71bab02a0e1064365e62c12c3a8e4f2 SHA-256: cf6fb21d1def5d92289ac1c4d322ec09fda1573e7056706022a42477b9cafa43
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the document's primary function being to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=trane+xe1000+air+conditioner+specs
    • http://meetporte.xyz/commentaire_de_texte_marcel_proust_a_la_recherche_du_temps_perdugdx22.pdf
    • https://cdn.sqhk.co/masamiwe/05vMhe6/nutevijutixobafukozavope.pdf
    • https://cdn.sqhk.co/xugikokazo/Ejggj0l/the_green_inferno_2015_parents_guide.pdf
    • https://cdn.sqhk.co/vipujitebiki/cGgf7if/chestburster_costume_homemade.pdf
    • https://cdn.sqhk.co/jirudumom/he2hDjh/at_t_tech360_advanced.pdf
    • https://cdn.sqhk.co/wadelovelo/ijghhd3/snake_vs_block_skins_unlocked.pdf
    • http://nicepics.xyz/lamoxufojiss3.pdf
    • https://cdn.sqhk.co/bokupajokim/ihJijgf/download_real_football_2020_offline.pdf
    • https://cdn.sqhk.co/baxorurifina/Fgf0vhg/91672975125.pdf
    • https://cdn.sqhk.co/gusisezepemu/mhdrhdb/zombie_drift_mod_apk_download.pdf
    • https://cdn.sqhk.co/rikopekela/jueIkDi/the_farmer_in_the_dell_lyrics_with_notes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_3dd5d15b106a43ddb1a066d994980a2d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/da861f9a-f56f-4e01-ba37-e5e4c733b30a/the_selection_series_by_kiera_cass.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/dolobumiwizugimewul.pdf
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_24e0d12b09cb484d9a9c068273b2a831.pdf?index=true
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_e6bc07cd04504fc8bc08adfa5a411294.pdf?index=true
    • https://s3.amazonaws.com/fejakixoweka/astute_crossword_answer.pdf
    • https://s3.amazonaws.com/jiwotarotavuz/benicio_bryant_agt_final_performance.pdf
    • https://uploads.strikinglycdn.com/files/12145bef-e33c-45cf-af9c-101fecb97e34/netgear_prosafe_xs708t_review.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_off00010214.bin
4637d0f85950493244cf1c38a97d8281949af0b99a9317bf1b4c9344cbdcd28c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 5244 bytes
font_01_sfnt_off000113fc.bin
c0002825b87796ca0423edcc04c65ff698e5951b4395e9c93453f689880c31c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113FC 11316 bytes

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