Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4e1381af67c0fc…

MALICIOUS

PDF

76.1 KB Created: 2021-03-19 12:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 22d1df3ca0d4ea737d247f87a061aab4 SHA-1: 53881d9710cc597533988eaabedc25af9a47dd7f SHA-256: 7f4e1381af67c0fc6a5df4ef57dd13043cde47d4b308066527c1d9adddc34ea2
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/wix?keyword=noco+genius+g7200+not+working PDF link annotation
    • http://gbarb.me/minugajexabepalst7d.pdfIn PDF document text
    • http://1cats.space/free_golf_event_flyer_template0979h.pdfIn PDF document text
    • https://didefitelov.weebly.com/uploads/1/3/0/8/130874246/4319063.pdfIn PDF document text
    • http://new-leggins.site/how_to_make_rope_halters_with_four_noseband_knots0udbk.pdfIn PDF document text
    • http://relax35.ru/vawopimuwosirusubogofe8bs7r.pdfIn PDF document text
    • http://pay-order.info/rijimuderojimimunerih7gnv.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/buzadizo.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/4699502.pdfIn PDF document text
    • http://topuniversityru.fun/the_legal_environment_of_business_text_and_cases_9th_editiong4uum.pdfIn PDF document text
    • https://pajowivi.weebly.com/uploads/1/3/4/9/134904739/gagaporem-felowidej-wafadano-pexivuwuru.pdfIn PDF document text
    • http://remontvorot24.com/crafting_guide_mod_minetestwk099.pdfIn PDF document text
    • http://busforpay.online/bafofimamazixegiso4dikg.pdfIn PDF document text
    • http://ogranicbio.space/xorunilefonawaxirupededp7gvo.pdfIn PDF document text
    • http://lorem.space/53_bank_locations_in_tennesseegek8l.pdfIn PDF document text
    • http://info-pages.ru/59067779731rcal.pdfIn PDF document text
    • http://gudokav.sportsontheweb.net/ejercicios_examen_toefl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/nizeg.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_df6cdc7d2e01489c80351d198c3fbbd5.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_7d60c7c48fbd48928dd350562eddef1c.pdf?index=trueIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_f6462f5c05164007b1ad7b38e1f466f5.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_9f5a4634693141d2a2d1b12f4b4103ad.pdf?index=trueIn PDF document text
    • http://guriseb.myartsonline.com/87501935355.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_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 5204 bytes
SHA-256: 997a204c2bb130db6516e8a01c778a21361cb98ad330d1846a4ae42d9d5e162c
font_01_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 11044 bytes
SHA-256: 1957ae1dfb9c7cf3aeffb077a01644ef8d51315a8873bd80610a44e2472cb8c8

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