Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c19dcdc4fe8439…

MALICIOUS

PDF

80.0 KB Created: 2021-03-04 17:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dd8d408e7da50858faa224dca2a68b0c SHA-1: e31bcd394bebd279f728eb9fc5e9d0ac77df2b9d SHA-256: d5c19dcdc4fe843981b4d415382dfe86f9daf1a3cd218c96f794dc28451ff61b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, one of which is `leonvi.ru`. The document body is heavily obfuscated and contains metadata suggesting it was generated by `wkhtmltopdf`, but no direct instructions or executable content were found within the provided excerpt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=weber+spirit+vs+genesis+forum PDF link annotation
    • http://bejawutipage.mywebcommunity.org/74035775586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447086/normal_5ffde6f873843.pdfIn PDF document text
    • http://3gusevshop.website/proform_585tl_treadmill_pricewezsu.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/the_writers_presence_9th_edition_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5ff4cbd2211d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487622/normal_5ffba5e81eb2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_6029c589825c9.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/how_to_replace_igniter_in_kenmore_gas_oven.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/moyer_administracion_financiera_contemporanea_descargar77ank.pdfIn PDF document text
    • http://segaruzobuguses.scienceontheweb.net/92657916207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389797/normal_5fcd73a6d381a.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/how_to_whitewash_over_painted_walls.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5fd2421fc1768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugazukadum.onlinewebshop.net/a_series_of_unfortunate_events_movie_plot_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0a521d-3de6-4bfe-a215-8daa2fa32257/how_to_empty_dyson_small_ball_vacuum.pdfIn PDF document text
    • http://fadudenomo.onlinewebshop.net/how_to_put_pictures_on_philips_digital_photo_frame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77754c6b-f6dd-42f0-a5f9-4789be554540/musidanudujakobixu.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/15059841248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4bc3888-0077-4738-a94a-42231e3f42d3/xifisebejof.pdfIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/pirates_of_the_caribbean_piano_duet_sheet_music.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 5192 bytes
SHA-256: b8d4dd3f35892c3b3b274c0cf81920375f578009ee22e044fddddbaad03a266a
font_01_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 10816 bytes
SHA-256: f4de771eacc13ba9d09e283b09e5ec852489a9d5690545044a2f412365de1c78

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