Malicious PDF — malware analysis report

Static analysis result for SHA-256 76886fa8d80ebbe7…

MALICIOUS

PDF

76.7 KB Created: 2021-03-27 19:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 15223be2f67311c54a858e74671a771a SHA-1: cbb6da8c6702f05d4efb05da32738c01c61fa2f1 SHA-256: 76886fa8d80ebbe7ef3a460eeca931ee94b846da624df2f2f5f2c8007f81f266
126 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. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/123?utm_term=lakeside+school+derby+ofsted+report PDF link annotation
    • http://gevenukodujojov.getenjoyment.net/16929498944.pdfIn PDF document text
    • http://vamoktin.ru/kawibebotipavc5w4.pdfIn PDF document text
    • http://robinmani.site/sidixakud276an.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://idealsit.space/bass_booster_pro_apkpured3dk0.pdfIn PDF document text
    • http://marojuburegorad.22web.org/a_dolls_house_social_setting.pdfIn PDF document text
    • http://cloudplay.xyz/loberahoc88.pdfIn PDF document text
    • http://picsonair.com/58243359245ybqfe.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/ccna_troubleshooting_labs.pdfIn PDF document text
    • http://sravniproxy.info/what_do_drivers_test_consist_ofn6op9.pdfIn PDF document text
    • http://bogplaktnc.fun/nor_baccarat_manual0pxzq.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/vavabi/4802760170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cb25865-dc66-4f4d-bc4c-e9b40ee953c0/58621894858.pdfIn PDF document text
    • http://pokitudid.epizy.com/rexajodew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5120b4ac-b0a0-46a6-ad80-8759f274c018/hp_10bii_financial_calculator_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ebc0b4-159f-46bf-9e64-f9c15a2331d4/16035878045.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/jogaxabutudusuwufazekil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0198f374-5215-44e3-8dc5-af6090fb438c/bryant_plus_90i_blower_motor.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/boom_beach_private_server_apk.pdfIn PDF document text
    • http://bejewidokani.rf.gd/microsoft_word_2016_test_questions_and_answers.pdfIn PDF document text
    • http://jifadeve.rf.gd/89859221821.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/55136518486.pdfIn PDF document text
    • http://zajegugolex.epizy.com/lojokumuguxavosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdff9bbd-b106-4cc6-b6ec-d1713ed402d6/xiduvepoluzinekegexekun.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_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 5492 bytes
SHA-256: 4533c62401193b7767dcf7c86ae1b7d0a242e37e5f779a7910dff9fd72af0253
font_01_sfnt_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 10792 bytes
SHA-256: 0d9464bbb9d763cfa4c0f51be33f12daca93969b2690223f70e36d30a40695d8

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