Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca7bced8a70d695…

MALICIOUS

PDF

74.6 KB Created: 2021-05-26 16:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 31fefddb34cab447562aaa4734c1f163 SHA-1: 0b1de08165aea4551492963d29c1b6e6385d3b5a SHA-256: cca7bced8a70d6959fdc54bb7d44cbe7231be6af66f19b2ba525ed1f42283817
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains heuristics indicating a social engineering lure to install a browser extension or update. The embedded URL https://botokaw.ru/strik?utm_term=how+to+do+a+checkmark+in+google+docs is likely part of this lure, aiming to redirect the user to a malicious site. No scripts were extracted, but the overall pattern suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://botokaw.ru/strik?utm_term=how+to+do+a+checkmark+in+google+docs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373778/normal_6022595e76c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490140/normal_601427bea9e46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_600de84869144.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_6007ee2bcae1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481411/normal_604ee21f5d9f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464707/normal_603b6a043e765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_6061a2f33335e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413346/normal_602af05f84c22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_600899261059a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486034/normal_5fee1fec6d8bc.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/a3125f59-3252-45c3-9d5e-192950ef0e77/10292964046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c738b9ce-6b98-4ae2-9eb0-66f4eb326bec/87555161689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df06a9e-88b5-4203-a051-5c52d79dacd7/best_beginner_yoga_routine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62316fe5-d5e1-41ea-9cf8-877ff90d5c1f/lubedureposekagevizesaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22effe00-9d82-4aa0-b707-b4eb2b068ba8/33306787572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c547970d-3e13-44f6-9870-d44cb56e8deb/nuluxinonifumikuzudopuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f69a6a2-0a13-4921-b3bd-77fd3b84d629/how_do_you_calibrate_onetouch_ultra_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ca9ca4-22ff-4dfe-b489-6f9a7c51c4f3/how_to_use_bond_function_on_ba_ii_plus.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_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 5468 bytes
SHA-256: 46efbdbf2d844b4ef6aef0fe8b9bbf1edc8eadc04bbd037b90d0d2fc70887abe
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 10228 bytes
SHA-256: 442bddbb6e89384162dd076114505352fcb98b236d9e45d0b43f3e5e811ccd8e

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