Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcef5ae3a10548e…

MALICIOUS

PDF

71.3 KB Created: 2021-04-03 17:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9164019c8f2a2d7384b2b574d75fea9b SHA-1: ae03fe72fcd41744905d8542f552cecd39d4be5e SHA-256: bbcef5ae3a10548ea0c303ef21ba08b4fbe85dd0e12ef26ded07eb0057f911d8
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple external URIs, with a primary suspicious URL being https://xezojetit.ru/123. The PDF also includes a link farm on disposable hosting, indicating a potential attempt to distribute malicious content or phish users. No scripts were extracted, but the overall structure and heuristic firings suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/123?utm_term=android+location+service+api+example
    • http://chistohome.moscow/35615443407io8sj.pdf
    • http://xovijezup.mywebcommunity.org/ketiregadid.pdf
    • http://1ux.site/4624347285439cy2.pdf
    • http://tadugebakonuged.getenjoyment.net/bsf_offline_form_2020.pdf
    • http://edayafar.xyz/wolf_of_wall_street_true_story_wifeol5sb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/74c2d13f-0a42-4e01-bcd2-a98cf95bb52f/cronica_de_una_muerte_anunciada_ingles_traduccion.pdf
    • https://s3.amazonaws.com/dumupa/phpspreadsheet_remove_border.pdf
    • https://s3.amazonaws.com/zabejuvijolu/viraf.pdf
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_1da60dbeb746453bb5dca2208f3063ff.pdf?index=true
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_e1cfce83fb704a29877a3254f93e52cd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9eb46517-95b8-4e2b-9494-c42eaf184570/sajedopikonabuw.pdf
    • https://s3.amazonaws.com/resabomibogodaw/40114354421.pdf
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_529e00a3906446f0af31a1c94a4f11d2.pdf?index=true
    • http://witesenigo.atwebpages.com/business_financial_plan_example.pdf
    • https://uploads.strikinglycdn.com/files/94904792-e67b-4284-a487-ca9d74f6b5ed/widuwiruranawe.pdf
    • http://bejanifezilo.atwebpages.com/goxuxeroguzubejaxeseju.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_off0000d822.bin
467aa339b6d36382df9463f94b28df2e5a825d4af5481c775ed1f15e9b84d7ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 5336 bytes
font_01_sfnt_off0000ea3b.bin
0b9d30c4e5d6a6582bae6cdcf25b4a6ab4ed52a07aeb5b1ca728bba2cf6c4c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 11144 bytes

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