Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4ceaf3d82f614b…

MALICIOUS

PDF

81.8 KB Created: 2021-04-12 07:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5fba9066d07992852d4cbe9a8d6705d7 SHA-1: b38b157a72ab6ff0e22987799b18a1c8a83d2559 SHA-256: 5b4ceaf3d82f614b036ff047136f1addd693971a92f48acac4ff3014b1e620a5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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=what+does+charli+d%2527amelio+order+from+dunkin+donuts PDF link annotation
    • http://good-production17.site/gikakomalokimpotcw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381529/normal_5ff98ca472167.pdfIn PDF document text
    • http://arbitestpark.xyz/stylish_text_generator_freev8iif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503584/normal_5fd0910a34881.pdfIn PDF document text
    • http://onkoprofi.ru/tovomunowovupupuwefav5mq2.pdfIn PDF document text
    • http://wekorarinorifen.iblogger.org/lurone.pdfIn PDF document text
    • http://world-wildshop.com/godikatigupesabortfqoi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_6040627997ee2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/75c93190-22b9-41f4-a975-4c32c68c1f07/spring_framework_tutorial_github.pdfIn PDF document text
    • http://wekidezeze.epizy.com/devolo_cockpit_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b4f492-d75e-4524-a722-3a6147dc5855/how_to_reset_comcast_remote_without_setup_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c266986e-7a91-4c2f-9d86-669104a16993/23553523747.pdfIn PDF document text
    • http://xiradev.rf.gd/building_commission_wa_forms.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 5256 bytes
SHA-256: b1b29cdfd9eb171c656ddaa9ea4dd7281b628d5cc4c4961a7834315ff664b59e
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 11820 bytes
SHA-256: 5586bf8f39749776a7a69c5ac7548b51eb8ce85ce0cc6f37dfa81e34ed5073b0
font_02_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 16132 bytes
SHA-256: 38fcf4ea3c4064495b9c09a7ef6946f56b1194f5b917bad2175a3786c2c34ca5
font_03_sfnt_off000129cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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