Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c056c675895545e…

MALICIOUS

PDF

77.3 KB Created: 2021-04-24 04:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e2677891346f4fae777d7d2bff8c9d50 SHA-1: 342655c6840d51f475632a509d38c57ef095b658 SHA-256: 7c056c675895545eab2ddcf90c789976b7c5ac53e90835fc255691d04bc8431b
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The embedded URL, https://jumiwimov.ru/strik?utm_term=world+map+outline+with+all+countries, is used as an SEO redirector to lure users into downloading a payload. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jumiwimov.ru/strik?utm_term=world+map+outline+with+all+countries PDF link annotation
    • https://cdn.sqhk.co/xufaribo/KcF5Lia/20983743333.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/celebrity_definition.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/feduminaro/Tgj4Kje/67963776525.pdfIn PDF document text
    • http://pshcomonhere.xyz/91048052287lugjg.pdfIn PDF document text
    • http://eurozone.pro/craftsman_table_saw_parts_model_137.2189kzyh.pdfIn PDF document text
    • http://clientesdkb.com/cardfight_vanguard_deck_builderriqqp.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/cFii8qa/direpa.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/85623089489.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/midizaxopazeji/yard_machines_snow_blower_oil.pdfIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/fire_and_ice_melrose_arch_bar_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c55195-6d2f-42a5-a653-18d597b10a27/83627854545.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/creeping_terror_3ds_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/the_squat_bible_hardback.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/happy_birthday_friend_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdf4e4c-0c8e-4c93-b3c9-242b1620a70a/introduction_to_project_management_online_course_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/66429040994.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/freight_quote_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/vanity_fair_outlet_mens_wrangler_jeans.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_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 5420 bytes
SHA-256: c18c520c192981bfe75622e6a51e68b472da62721b3e1f6250142b02b1ae07e4
font_01_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 10848 bytes
SHA-256: d9d4c98cedc1674727987ffbf8c13df68312622c8dd92a4c3fde13cbf15b8774

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