Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dec33b2f6041e20…

MALICIOUS

PDF

73.1 KB Created: 2021-03-02 21:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f500882844a16e208472eb04d5fc8734 SHA-1: 394e1e0d149316a2fdcdd28ca97ce938436f0fc5 SHA-256: 3dec33b2f6041e201b4a396ca31dedfc564ddb47ee8f633ce114a2596bcc8194
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 0.9997

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
  • 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://druttle.ru/123?utm_term=what+is+the+best+chess+app+for+ipad PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485173/normal_600668aaaea15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_602dfda61d1ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450724/normal_5fce878352259.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/xukisavigoveriferosoluw.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/hp_easy_scan_not_working_mac_high_sierra.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_602ec75b79cfa.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/jbpjez2/17841606606.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/77351494184.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/Dhaijid/survival_rate_of_leukemia_in_toddlers.pdfIn PDF document text
    • https://zifalopo.weebly.com/uploads/1/3/1/3/131379769/377018.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/sat_test_prep_courses_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/Pgfr5yd/sadikelosogudotixiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_6012fd592831b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nenezonel.rf.gd/easy_english_conversation_dialogues.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_off0000e04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 5364 bytes
SHA-256: 4cc09dff01d5db8cbabc68bb7296799bd230ed62ef66455a30bd6f09e79b55ee
font_01_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 10948 bytes
SHA-256: 564c70780be6e37dc44d35a83ad260e71e1311ddcd41289e25f2717abede1213

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