Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f204204b54b02fb…

MALICIOUS

PDF

85.0 KB Created: 2021-03-18 06:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 151ca7deab0c4b95cb801a9524a4ac63 SHA-1: 126eb3aafc69ac420aaa6ce8fc9abb5831bad96b SHA-256: 4f204204b54b02fb910fe6f1bc873dfbb255990aa68abd4bda62a51d508aea2e
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-optimized, suggesting a link farm or phishing attempt. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing trojan. The document body, though heavily obfuscated, contains keywords related to learning English, likely a lure to encourage clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=apprendre+anglais+pour+debutant+pdf
    • https://cdn.sqhk.co/suwuwewazaka/dHhcBid/logo_maker_free_logo_creator_lab_graphic_design.pdf
    • https://cdn.sqhk.co/sozonexof/jbigqig/zonokomi.pdf
    • https://cdn.sqhk.co/xejudawadoni/jisoQhe/samsung_email_gmail_unable_to_validate_account.pdf
    • https://cdn.sqhk.co/bewewojiwo/PPFROib/forza_horizon_4_best_s2_hypercar.pdf
    • https://cdn.sqhk.co/gukawaki/bgdoheI/the_last_stand_union_city_hacked_online_games.pdf
    • https://cdn.sqhk.co/xemugugafot/eT2Siij/what_sea_animal_are_you_playbuzz.pdf
    • http://ruwemipuwev.mypressonline.com/fuzad.pdf
    • https://cdn.sqhk.co/zidodovare/b2eGxih/jeposukazulota.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_eb8558a7b75346daa2bf8d30e121c5cb.pdf?index=true
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_53ee7adab397419fb56d77356b62c2d9.pdf?index=true
    • http://megigezorozo.atwebpages.com/rabedudebojoxikix.pdf
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_d1714a8014b44b928a756ce650783473.pdf?index=true
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_80825ec0ff57465bbb4673fe520e1659.pdf?index=true
    • https://s3.amazonaws.com/fefurorobumi/90771854447.pdf
    • https://uploads.strikinglycdn.com/files/f77f6c5e-dc58-4ee9-bb68-415d9a2c9300/43752122586.pdf
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_a56359abd27d420590693666ad77f01d.pdf?index=true
    • https://s3.amazonaws.com/ponivotigegepub/13020726722.pdf
    • https://uploads.strikinglycdn.com/files/6619295a-e141-43a9-8ce6-f44776eeee13/couch_to_5k_treadmill_plan.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/dreamweaver_software_for_windows_7.pdf
    • https://uploads.strikinglycdn.com/files/6374bc8a-0e7f-4fbf-a28f-86ad05aa337d/53103009094.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa06.bin
8522561e56dc4aa1e24d7f8194443676aac5772b18dc1a4e09752b78bde05f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 6504 bytes
font_01_sfnt_off00010a3c.bin
634d858bdacb3861fcbf4e81c31ea48131bb463f50eeb04169b663de88b0a884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 5336 bytes
font_02_sfnt_off00011c6b.bin
27447c74cea02e75613bce6d5a6a4fdf749bbaedcd09febc186a3d9d83cd5f0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6B 12812 bytes

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