Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a87267b92705fd…

MALICIOUS

PDF

84.9 KB Created: 2021-03-23 16:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c5735cfd3c1d48316e000f1bbcc8b1e SHA-1: 90d0c4d087b91c4497a6dc493b12e46ce270b3f2 SHA-256: c5a87267b92705fd7fd70b4bde647d7634f4c0ec2fa1ce3fa7754e060207de9f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a tactic often used in SEO link farms to manipulate search engine rankings or redirect users to malicious sites. The primary malicious URL identified is seumenha.ru, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://seumenha.ru/strik?utm_term=historia+de+estados+unidos+resumen+corto+en+ingles
    • http://masajsalonunuz.com/how_to_tell_what_plants_are_ediblevdmj9.pdf
    • http://welitizenowem.mywebcommunity.org/ge_phone_number_for_service.pdf
    • http://natiral.space/diy_rifle_cleaning_stationvrdtl.pdf
    • http://sevowina.medianewsonline.com/logitech_create_keyboard_backlight_not_working.pdf
    • http://prizinsta.online/world_physical_map_blank_a4_size23v0w.pdf
    • http://kkkirrreeee.space/pampered_chef_food_chopper_ebaycjooa.pdf
    • http://secureappeal.com/google_analytics_exam_cheat_sheettslu3.pdf
    • http://dorulezebum.sportsontheweb.net/33217917739.pdf
    • http://dusejetiwogodad.getenjoyment.net/boolean_algebra_symbols.pdf
    • http://vomidujoma.scienceontheweb.net/little_red_riding_hood_short_story_summary.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b595a6f9-6bcb-48d8-acfc-7cb8c696cf55.filesusr.com/ugd/21f311_c2852c0a6ffb4815af6d3f7030ee64cc.pdf?index=true
    • https://s3.amazonaws.com/rutufokedizon/88571141583.pdf
    • https://s3.amazonaws.com/tetofamuxulil/what_is_stephen_hawking_best_known_for.pdf
    • https://s3.amazonaws.com/tevigotu/wiwuwimedoxamufutuxelawe.pdf
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_0aa9ad9d1716439da74e33dfeedc4c26.pdf?index=true
    • https://s3.amazonaws.com/jamuluvuvava/practice_conversational_english_online.pdf
    • http://sifebitufol.onlinewebshop.net/69715880418.pdf
    • https://s3.amazonaws.com/zevutebulaworel/35282225500.pdf
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_deda3580bffe4a96a717b10e8f944c43.pdf?index=true
    • http://xowobovu.myartsonline.com/download_game_simcity_4_android.pdf
    • https://s3.amazonaws.com/gotenukevepunin/92761370077.pdf
    • https://s3.amazonaws.com/xefezesebusu/sat_preparation_classes_in_delhi.pdf
    • https://s3.amazonaws.com/bifamomove/white_metal_detectors_for_sale.pdf
    • https://s3.amazonaws.com/xonobijikivo/25085213339.pdf
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_0b970591023c4cd3860382a30c3716bd.pdf?index=true
    • https://s3.amazonaws.com/diwitapezu/why_are_conflict_resolution_skills_important.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_off00010d90.bin
1941148346d35e5ae917c04ffbdd5e4c3e83f456acf079b773d4f9853cf46758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 5220 bytes
font_01_sfnt_off00011f34.bin
6ad05991aefc46f2f27449db35febd60b12f44e38392f71b514d10c88fc8c84b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 11408 bytes

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