Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9cc6a1067c4a93…

MALICIOUS

PDF

77.8 KB Created: 2021-04-17 05:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8aaaa2cfef8bdc4add86ae626199d04e SHA-1: 2becc8f404eafe4bfd733d8fcf6fa9326e31f875 SHA-256: ef9cc6a1067c4a9380e82a81ded8e3b2ae4dd74c550c49beca63e172fc5ee621
226 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to lure victims. One suspicious URL, http://loginwithweb.site/pudebudewoboks783i.pdf, is directly linked to a phishing lure for an Excel update. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=excel+2013+update+download+32+bit+free PDF link annotation
    • http://kewugujijafe.iblogger.org/sugid.pdfIn PDF document text
    • http://loginwithfb.site/pudebudewoboks783i.pdfIn PDF document text
    • http://purpless.vip/jininita5uxd8.pdfIn PDF document text
    • http://bolilojopadok.iblogger.org/ultrasonic_cool_mist_humidifier_not_misting.pdfIn PDF document text
    • http://help-ruleviolation.com/46309464319dca9r.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/la_historia_de_la_democracia_en_mexico_linea_del_tiempo2ndy6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/827a2030-9268-42f6-9486-8ea544772343/16584251375.pdfIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_7cff8c5c62624cbebf8df5f9b42680da.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_f8ec482958184013825d7239e6ae839f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupojakami/cuneiform_cartilage_of_larynx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7095470b-9921-4e1f-ae57-7430b61214f8/80695946282.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/2130174619.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_8ad733a175cd4da9833b40da7b593dfa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4bda9f-3170-44fa-a120-96d0291b8a99/35371762649.pdfIn PDF document text
    • http://zexilejogela.epizy.com/air_hogs_millennium_falcon_quad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df608150-82a6-4d43-9ac8-1cca6c9ff50b/the_organic_grow_book_karel_schelfhout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7507ad6-80e7-42a2-b388-d070d1ea9ff3/what_does_bible_say_about_drinking_milk.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/mind_power_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/how_to_draw_a_realistic_warrior_cat_step_by_step.pdfIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_fa2d09e1bf994d6d99d8918b97014f00.pdf?index=trueIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_11088d0fb35c420381e54e4130c453d5.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 5720 bytes
SHA-256: e334f484bb1fa7a3c9d31899c2c45d532dca7001246040c8d420eec10dd77030
font_01_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 10808 bytes
SHA-256: 6925b392d317f22cfd0df0c48ecba0f3ef2e8a18ba28458b9337a321b9010b52

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