Malicious PDF — malware analysis report

Static analysis result for SHA-256 21897009f5ae7463…

MALICIOUS

PDF

75.2 KB Created: 2021-03-06 10:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bd4b2686a34936ce335dfe7eaf602c4e SHA-1: d95c4155568b1b1a84a3b46a9b368f24f372b2e2 SHA-256: 21897009f5ae7463df783e1dbf19e1e3bc51c4d50cb602d20ec1ef2001967b06
146 Risk Score

Malware Insights

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

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 on disposable hosting, directing users to URLs such as 'https://lozipotod.ru/award?keyword=what+happens+if+drivers+license+expires+during+covid'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, aligning with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://lozipotod.ru/award?keyword=what+happens+if+drivers+license+expires+during+covid PDF link annotation
    • http://checkmycredit.info/pujolofuwedubagz1h.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/namover.pdfIn PDF document text
    • http://comp-arenda.site/who_is_d_chief_of_army_stafffz4nm.pdfIn PDF document text
    • http://activa-fb.com/baaghi_2_3gp_video_song_tinyjukesg5mm.pdfIn PDF document text
    • http://canonsburglake.com/zoludadanixovotedilugafsb7.pdfIn PDF document text
    • http://rankingcoach-seo.com/477800913127qdat.pdfIn PDF document text
    • https://datagoso.weebly.com/uploads/1/3/4/7/134718767/xubebexukebu_fawekag.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/b223dc938aa0e.pdfIn PDF document text
    • http://umniashka.ru/namugoborevituleruxanvjhk.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/zavolejuwerilin.pdfIn PDF document text
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/makajo.pdfIn PDF document text
    • https://jaduvobawitirok.weebly.com/uploads/1/3/4/3/134398576/vetulo-lavebomagapote.pdfIn PDF document text
    • http://marketop.club/history_of_japanese_language_booki6eyp.pdfIn PDF document text
    • http://afracheat5.xyz/dub_music_player_pro_apk_crackedtjtsh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_6626a2a294084005a6fa4f17ab6c8706.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/euro_truck_simulator_2_activation_key_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/gupili.pdfIn PDF document text
    • http://guseboses.atwebpages.com/a_christmas_carol_2020_where_to_watch.pdfIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_3535e3f4ca6642188deb8f6593b4020a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotenu/what_age_group_are_the_horrible_histories_books_aimed_at.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_9010ee7808e2481692cc72ef22ded834.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/fakorejut.pdfIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_a30040cf38d6466598f0c96060adabcf.pdf?index=trueIn PDF document text
    • http://zikoliduxa.atwebpages.com/bless_me_ultima_summary_chapter_2.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_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 5560 bytes
SHA-256: fa5201fcb36724762ccdc858842eb91db64b4df8900e84bd793fd5f1f258a956
font_01_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 10644 bytes
SHA-256: 230995f7b180ec657ec5bb06cc3ff1350824bdf3ca4bff8002b5cccb47439192

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