Malicious PDF — malware analysis report

Static analysis result for SHA-256 476483289ebb8d7f…

MALICIOUS

PDF

76.1 KB Created: 2021-03-14 04:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 406c8c08ab118e772e826458b1b7a3b6 SHA-1: bf78515c4e2dac68a46252752126dc5ad826b4a4 SHA-256: 476483289ebb8d7fe025b04644844602238b778d32bb448c93dfe21b06e720fd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious or unwanted content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to drive traffic to external sites, possibly for credential harvesting or further payload delivery.

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://bologen.ru/wix?keyword=why+is+my+printer+printing+blank+pages
    • https://cdn.sqhk.co/tenalewi/cig7hcz/77899698845.pdf
    • https://cdn.sqhk.co/luxixumogez/khbjeda/fort_squad_battleground_survival_shooting_game_download.pdf
    • https://cdn.sqhk.co/bovutolomevo/jepMmbK/mi_calendario_de_iphone_tiene_virus.pdf
    • https://mopuvavipobum.weebly.com/uploads/1/3/1/0/131070525/zoniz.pdf
    • https://cdn.sqhk.co/goduwonon/chdiahi/texabexuliwunununozaxe.pdf
    • https://cdn.sqhk.co/wuxobilan/hHRQTha/gegugirimapowarizipala.pdf
    • http://nokirixako.iblogger.org/travel_guides_commentator.pdf
    • https://jebezijako.weebly.com/uploads/1/3/5/9/135964749/3af6b2f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/010775d7-dc06-4fc9-a54a-f955fe0653dd/how_to_solve_fgx_functions.pdf
    • https://uploads.strikinglycdn.com/files/c4623db3-5142-48d5-9b79-8b1992b16803/77268434836.pdf
    • http://tamegebodow.epizy.com/dictionary_english_to_english_longman.pdf
    • https://uploads.strikinglycdn.com/files/8b226dce-261f-4cda-8167-4b1cb9018bdc/kewofosijiramajubogubuli.pdf
    • http://teruwizirazi.rf.gd/dotusemokomelulevalota.pdf
    • https://uploads.strikinglycdn.com/files/acaf64a3-b4b2-4552-b2a7-6d66e2819d70/gta_5_cheats_ps4_unlimited_money_download.pdf
    • https://uploads.strikinglycdn.com/files/e8e70e9f-f639-46ba-8b03-afdefc974210/42209539054.pdf
    • http://tabifewegijip.epizy.com/guided_walking_tours_australia.pdf
    • http://towilisok.epizy.com/nudiduwagolelenin.pdf
    • https://uploads.strikinglycdn.com/files/cf7ddf43-df27-49bf-a26b-0e8852720b9a/75557880300.pdf
    • https://uploads.strikinglycdn.com/files/87d1737b-95c6-4db7-b85b-adbcff59e790/53274590632.pdf
    • https://uploads.strikinglycdn.com/files/e118d258-a6db-4348-bdff-0e13a369093c/american_standard_oil_furnace_reviews.pdf
    • https://uploads.strikinglycdn.com/files/c091d6bf-79b2-4b6d-8cdb-acd919037dad/what_does_service_engine_soon_mean_ford_fiesta.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9d.bin
ed0e25e086890eb667c556e9adaa96cb0ee2e0475929b7b51703981fc33aef23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 5232 bytes
font_01_sfnt_off0000ef3e.bin
beacb83238ac61d9263f14a0e97a1ef13c89213ce020c1bb57e4dd65ed6ed5c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 10848 bytes
font_02_sfnt_off00011478.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 4324 bytes

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