Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0556bc7dc43ca80…

MALICIOUS

PDF

79.1 KB Created: 2021-06-03 14:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a328e5b59cf79a483a8b9218cb865a38 SHA-1: d77830a12603aeb7be6848911b87971d414430ac SHA-256: e0556bc7dc43ca8087ee1b974157c1a6ad01afbd00542ea028863637b2c6d0e5
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 point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing or trojan variant. The document body, though heavily obfuscated, suggests a lure related to 'English hood a2 b1 workbook cevaplar1 pdf', which is likely a pretext to drive users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://garglob.ru/pbw?utm_term=english+hood+a2+b1+workbook+cevaplar%25C4%25B1+pdf
    • https://cdn-cms.f-static.net/uploads/4482671/normal_605998091a73a.pdf
    • https://cdn-cms.f-static.net/uploads/4451225/normal_602d76dbe13d0.pdf
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/pawesonexulu.pdf
    • https://besozidemupi.weebly.com/uploads/1/3/4/6/134635439/ragizaxu.pdf
    • https://static.s123-cdn-static.com/uploads/4453740/normal_60041bddd96b8.pdf
    • https://leladuginaxiwo.weebly.com/uploads/1/3/5/3/135320554/tuwuveram.pdf
    • https://fisuxujatuma.weebly.com/uploads/1/3/5/3/135345375/2970558.pdf
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5feb621e2e118.pdf
    • https://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/3952163.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7e56f932-fdcb-4336-8c7c-6252c613dbc5/goxuferujekedexop.pdf
    • https://uploads.strikinglycdn.com/files/a84996f4-d96c-42a7-9138-b36ec5e28386/how_to_update_my_garmin_nuvi_255w.pdf
    • http://fijinatuzut.pbworks.com/w/file/fetch/144546567/potuteruwapilutidegofiz.pdf
    • http://pazimonofe.pbworks.com/w/file/fetch/144462225/free_online_candyland.pdf
    • http://demopefo.pbworks.com/w/file/fetch/144525525/christian_brothers_college_high_school_athletics.pdf
    • https://uploads.strikinglycdn.com/files/31757283-d9b2-436d-b39d-3a4480451ea2/frmula_para_convertir_milmetros_a_pulgadas.pdf
    • https://uploads.strikinglycdn.com/files/bfd18555-1756-4780-8ee9-4481af867af7/rivuze.pdf
    • https://uploads.strikinglycdn.com/files/1150e8c8-2f2f-438c-9c93-abbe3b04a918/xawerabutusawewexilefek.pdf
    • https://uploads.strikinglycdn.com/files/c8639a7a-4a8d-4d97-8924-202d16726bcf/congruent_supplements_theorem_geometry_proof.pdf
    • http://fevawigo.pbworks.com/f/admiral_dryer_aed4675yq1_manual.pdf
    • https://uploads.strikinglycdn.com/files/2113cb4f-8781-4d96-b662-233e4f2143ce/how_much_does_a_snow_blower_tune_up_cost.pdf
    • https://uploads.strikinglycdn.com/files/dd3b9a2e-7571-471f-aa1e-663f0ca10515/plot_graph_in_word.pdf
    • https://uploads.strikinglycdn.com/files/da10e366-1ba4-483c-a034-bf687940d844/diablo_3_wizard_build_tal_rasha_vyr.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df43.bin
e9a92db66612909be2a5ba4cfa8b2d19e04ee5cc9fbd5ff23f0d42080c1e3f95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 5944 bytes
font_01_sfnt_off0000f39f.bin
3dddd49be8ac99d75848bc6ab4ccef54f19d2c6643ed783cda67a240690c7501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 10268 bytes
font_02_sfnt_off000116d2.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 16204 bytes

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