Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c4d14e1c950765…

MALICIOUS

PDF

75.5 KB Created: 2021-03-28 14:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ebee8a9dcf37ca7316ab27526ef11641 SHA-1: df35973f25ac423fa301451eeaa9d323b37d0daf SHA-256: a9c4d14e1c950765cc2183fef7a67de1f1ff4cce0f7f76e2c05528f9bf03cce2
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The document body contains garbled text but the presence of a high-risk heuristic indicates an 'Image lure linking to an SEO redirector (free-download phishing)'. The primary IOC is the external URI pointing to zajinet.ru, which is likely used to host the phishing page or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/award?keyword=absceso+hepatico+amebiano+pdf+cenetec PDF link annotation
    • http://ig-mediateam.net/luvojafabawetupij2m6a.pdfIn PDF document text
    • http://magnitoli-2ekran.site/2008_dodge_grand_caravan_key_fob_battery_replacementj6jw0.pdfIn PDF document text
    • http://moitender.org/65953651861ilhbv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450638/normal_5ff755d244fd5.pdfIn PDF document text
    • http://leririv.sportsontheweb.net/2020_malayalam_manorama_calendar.pdfIn PDF document text
    • http://hhizmet.com/how_many_companies_are_listed_in_us_stock_marketsh4n3.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekezaru/77448942053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07d40a9-fc00-45a9-84da-eb6fe6058794/will_tax_brackets_change_in_2021_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/how_to_practice_sudarshan_kriya_yoga_breathing_technique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc18b9d5-3562-4749-8000-d00c65f58619/vileko.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/715495013.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/la_maestra_del_amor_captulo_11.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/denokijofovokepib.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/why_are_school_rules_important_to_follow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424734f0-1b4f-4f8d-a991-f8d825c527f9/what_was_the_october_revolution_1917.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/total_war_attila_building_guide.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/jelafafifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b41757-f75f-427f-afc6-71e66f73f23f/pawesupuluvil.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/vedekelaz.pdfIn PDF document text
    • https://doi.org/10.26820/reciamuc/3In 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
    • https://doi.org/10.26820/reciamuc/3.(4).octubre.2019.76-92In 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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 1604 bytes
SHA-256: 226bd5aa29336cbeea36adaa23de9bcbf462af96c95180cf9e4e6541895b5f4c
font_01_sfnt_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 5396 bytes
SHA-256: fd007334b7ad4385c0de4fff81f48350bb50b777b5e356aa0364523e8fe0d6fe
font_02_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 12672 bytes
SHA-256: 66f70f4f881f3db0ad306436cb18c6c4e665e2fa0e67114a50be906b5842624c

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