Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7b105e45171249…

MALICIOUS

PDF

79.3 KB Created: 2021-03-25 03:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20ac6d0a10a9774feb9b665dbac8ad17 SHA-1: 81cb043f501be1319f2b4fb44cf4024ed1c0f408 SHA-256: 5f7b105e451712496538acdf5f1c5d6c896b84b5262349fa6fab81a725cbf0ca
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing. The embedded URLs, such as 'https://mezovuduw.ru/strik?utm_term=brainpop+states+of+matter+worksheet+answer+key', suggest a lure to a malicious site. ClamAV and ML heuristics confirm the malicious nature, flagging it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/strik?utm_term=brainpop+states+of+matter+worksheet+answer+key
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/8503e88.pdf
    • http://sokixatov.mywebcommunity.org/medanu.pdf
    • http://tafugegajotu.mygamesonline.org/biografia_gabriel_medina.pdf
    • https://cdn.sqhk.co/wexunaveb/djatuMY/hotstepper_original_sample.pdf
    • https://cdn.sqhk.co/bidogefapo/Lghygje/mediq_health_coaching.pdf
    • https://juxagoneponux.weebly.com/uploads/1/3/1/3/131384300/gogopuzuboxe_disepaz_wegoso_dazotinetaj.pdf
    • https://cdn.sqhk.co/sepufaziru/ij4zitf/monster_high_maker_game_online.pdf
    • https://cdn.sqhk.co/lunosupi/dnifWha/cross_road_crash_driver.pdf
    • http://volalagokiva.sportsontheweb.net/nubukowonujolosiwado.pdf
    • https://cdn.sqhk.co/letarezetap/BgfBgji/jidetur.pdf
    • https://cdn.sqhk.co/fepogosu/iajhlhd/52458399888.pdf
    • https://zipezeroluxufa.weebly.com/uploads/1/3/4/9/134904793/wajaj.pdf
    • https://cdn.sqhk.co/takabalal/CgehFja/harvesting_blazing_star_seeds.pdf
    • http://laribij.scienceontheweb.net/34450770071.pdf
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/837364.pdf
    • https://naxofezuwu.weebly.com/uploads/1/3/5/3/135396878/ruzabiribugotu-gixanela-gijebeka.pdf
    • http://josumewemuzob.getenjoyment.net/winesig.pdf
    • https://cdn.sqhk.co/pibilebomek/eIFjEih/gitokewakoloxorav.pdf
    • http://goladelexugezi.sportsontheweb.net/7266721691.pdf
    • https://cdn.sqhk.co/fegojujor/jWjbhaa/belufafagiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1cd51b8d-1eb5-4930-8b7a-eea302a6042f/cinderella_play_script_for_kindergarten.pdf
    • http://gixarewujedel.atwebpages.com/angularjs_6_download.pdf
    • https://uploads.strikinglycdn.com/files/856b223d-ecf6-49d6-8d95-24e65af6bb84/excel_vba_loop_through_range_and_get_value.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_off0000f678.bin
06e7c10950f3a6a7774e92bd5ccd9061f77983396558eb672b81b3894a66983e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 5416 bytes
font_01_sfnt_off000108d4.bin
f694133268b506f691f72c4d7989a015e7df001b5e6c5fe22fd73b97ec5d541b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 11392 bytes

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