Malicious PDF — malware analysis report

Static analysis result for SHA-256 303c794e4e40ce28…

MALICIOUS

PDF

77.0 KB Created: 2021-03-11 17:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fa4a9ad01b038eeb955316f9c8bb80a8 SHA-1: 195f4b0be3630463bef0d369ed7e965ba941e848 SHA-256: 303c794e4e40ce28b12d1a31caca1821453c7f2b19bc702fa24eef2efc6bd49a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The document body, though heavily obfuscated, contains text related to 'The Legend of Zelda' and the wkhtmltopdf application, suggesting a lure. The primary malicious IOC is the external URI pointing to 'maypoin.ru', which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://maypoin.ru/award?keyword=the+legend+of+zelda+ocarina+of+time+guide+pdf PDF link annotation
    • http://kukukoboda.22web.org/48831027531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444856/normal_600aa6fbb3300.pdfIn PDF document text
    • https://bomutakarekavag.weebly.com/uploads/1/3/5/3/135330682/0aa199c0c5.pdfIn PDF document text
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/9380153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_600c9d83e7e9a.pdfIn PDF document text
    • http://pofuxujeku.iblogger.org/appvn_para_pc.pdfIn PDF document text
    • http://januvasiw.22web.org/cant_connect_plantronics_bluetooth_to_iphone.pdfIn PDF document text
    • https://favasonod.weebly.com/uploads/1/3/2/7/132740296/zajelegi_bofatulunusok_natenobetani.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383321/normal_5ff22bd15b3ea.pdfIn PDF document text
    • http://doxisolawasusig.66ghz.com/viwufapilomixurotoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_6040736de6c13.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/boxokujifemota-nabotiwesi-gegub.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/gebik-kimazunap-famotidewuwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/wiregajaxuxapafuk.pdfIn PDF document text
    • http://vudogomudem.rf.gd/16875140057.pdfIn PDF document text
    • http://mowesedapi.epizy.com/kefotegilesusoxa.pdfIn PDF document text
    • http://fudixuxutinizow.rf.gd/41521123454.pdfIn PDF document text
    • http://ropasibemufi.epizy.com/buffalo_nas_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/33714119337.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/how_do_i_find_out_where_my_septic_drain_field_is.pdfIn PDF document text
    • http://jigiwema.epizy.com/78371612446.pdfIn PDF document text
    • http://sozidasagekixur.epizy.com/english_cursive_alphabet_worksheets.pdfIn PDF document text
    • http://nibudikugi.epizy.com/jogisisutetogukofu.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/70000553968.pdfIn PDF document text
    • http://xaxidos.epizy.com/extended_backus_naur_form_tutorial.pdfIn PDF document text
    • http://tafituza.rf.gd/44430904429.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_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 5388 bytes
SHA-256: 5d6186e5bf879fe0b7ff0d361c5f3fb827d71e0c2b693ee5e691968fb32a7758
font_01_sfnt_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 10744 bytes
SHA-256: 61f892c2396fce017379747e8889722b54bba723a557b20ffc21fb1e01c18169

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