Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b59e816a58ccc5…

MALICIOUS

PDF

80.4 KB Created: 2021-03-05 08:59:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e77fd0b5538b592ad20d0a633acb58b4 SHA-1: 37be0e72dd8cc66657df59bdef6d806564429a30 SHA-256: e4b59e816a58ccc5e429db641183f6216e57ebc4b5d06e38f61141fd05d8107b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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 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.
  • 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://kuzutuzo.ru/award?keyword=el+aleph+resumen+el+pensante PDF link annotation
    • http://pazefezos.mywebcommunity.org/vaxoretujuga.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/b8heVx1/software_update_failed_on_ipad_2.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/qWhahcv/.pdfIn PDF document text
    • https://cdn.sqhk.co/pulijidapis/hb3Ybnd/postknight_stats_build_guide.pdfIn PDF document text
    • http://samoe-samaya.ru/pmd_clean_pro_gold_reviewszh96t.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/85363383770.pdfIn PDF document text
    • http://pochta-24.cc/chapter_2_test_chemistry_of_lifeyb4xc.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/ihjYijr/ditemiwidovuwojo.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/kugupekuvajibidedis.pdfIn PDF document text
    • https://cdn.sqhk.co/nopavoboriru/1njegiC/79270717498.pdfIn PDF document text
    • http://webcam-model.online/fituwoduremavowonizjh9mf.pdfIn PDF document text
    • http://skywonder.space/how_long_to_cook_a_prime_rib_in_the_big_easy8nr5e.pdfIn PDF document text
    • http://organicnu.info/las_cloacas_del_periodismo_reportajefngle.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/hgfecjg/fake_girl_voice_call_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sudizatase/LpLhfjb/imdb_vikings_cast_season_3.pdfIn PDF document text
    • https://cdn.sqhk.co/terodekijur/ichAifT/paycell_kart_nedir_nas_l_kullan_l_r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_760b69bc34f94d758d0aba4c9032a1bb.pdf?index=trueIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_6de1391de72e4350af33f8a6207c622e.pdf?index=trueIn PDF document text
    • http://gipebevu.atwebpages.com/xofuriluzobuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2f89b3-ff77-47b4-b629-f2d37caae0c4/the_lottery_by_shirley_jackson_literary_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b124c2e5-9a38-401d-b63c-42dc58ef6161/why_wont_my_garmin_nuvi_turn_on.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_285fb332099e4ba3a552c3e0422dcb09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ab5604-8703-4636-9bce-4138109ab2fc/ps_vita_ps2_emulator_2020.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 5016 bytes
SHA-256: b8fe7202eeb7e2b16e834dc3164752612b0df2da89d6fdf55cc9a9bfa1dccdc3
font_01_sfnt_off00011198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11198 11212 bytes
SHA-256: 029381b2d120e573d0a590558c0d46cd47188d981324fcb430d2e10e995591ce

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