Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb24d3805e401fb…

MALICIOUS

PDF

110.2 KB Created: 2021-02-07 01:27:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4de47787a8a5a7332f45f83c5d6a878d SHA-1: 3572da59b129201164d9f1eb563b0f1b537795e6 SHA-256: 5eb24d3805e401fbbb03ef985a5b0933f75e85a0bd1dbac8bb4d7a64acdab2b1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm hosted on disposable infrastructure, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=na+drini+%25C4%2587uprija+pdf+hrvatski PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483864/normal_5ffa862ec778d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482854/normal_5fec6bd375db3.pdfIn PDF document text
    • https://cdn.sqhk.co/diduwuposenu/ihhggd4/33146719034.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/pjcVj0C/roman_empire_at_its_peak_map.pdfIn PDF document text
    • http://keribek.22web.org/telugu_love_feeling_songs_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/cgiK5hj/nipavebiferisisotelijalo.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/33haXia/87722669020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_5fd8985d32941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_5fd8b776a35d2.pdfIn PDF document text
    • http://kuzunutonaw.22web.org/7153458946.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/FiSjj4q/61475562059.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visiresape.epizy.com/camelot_musical_script.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/tadodaworuwimeb.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/dedivorerumomob.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/66140395630.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/wosewavufewigazigaxesek.pdfIn PDF document text
    • http://vodobugatusexa.epizy.com/amicron_faktura_8._5.pdfIn PDF document text
    • http://xegebasitez.rf.gd/android_10_redmi_note_7_release_date.pdfIn PDF document text
    • http://susebuxusebug.epizy.com/citra_emulator_for_android_apk_free.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_off0001728b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1728B 5404 bytes
SHA-256: 44846d527a71644ad663c07f3f732770d5783cacfac14932eee4fc51dd233aaa
font_01_sfnt_off000184fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184FC 11584 bytes
SHA-256: a0905d46181c8e7b81dea36a4dda1f8470841af351b5f21df92676859cf45fd8

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