Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ec7d345de1cda9…

MALICIOUS

PDF

78.9 KB Created: 2021-02-17 12:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 70f11cdc770d374ce5073f8bd9d1826e SHA-1: c7c5a9441936c2f14cfb0c533d215a3ade5b34ae SHA-256: 34ec7d345de1cda90dd9b20815c8389ded61d3ff1cc6c861cfa9969c263aef89
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 0.9998

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://jottigo.ru/wix?keyword=monterey+high+school+mascot PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388413/normal_5fe56568e8927.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/6009229.pdfIn PDF document text
    • http://voiprormul.xyz/retap1flo7.pdfIn PDF document text
    • http://ylyn.ru/65281885519qr4fi.pdfIn PDF document text
    • http://lisifakus.66ghz.com/free_adding_and_subtracting_worksheets_for_kindergarten.pdfIn PDF document text
    • http://gasomenuza.iblogger.org/75350196307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472186/normal_600c426dc74c0.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/zofaxu.pdfIn PDF document text
    • http://natbeach.space/76783628501imbye.pdfIn PDF document text
    • https://rawonosegapit.weebly.com/uploads/1/3/5/3/135314608/47bb547805efb5.pdfIn PDF document text
    • http://kinoxca.xyz/bizhub_c220_installation_manualjnk9o.pdfIn PDF document text
    • http://rrrrkkkkk.space/html_css_javascript_portfolio_templates_free_download6pju3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rumapipenuwiwo.rf.gd/latest_android_smartphones_under_20000.pdfIn PDF document text
    • http://dexifuv.epizy.com/80705653206.pdfIn PDF document text
    • http://nametelival.rf.gd/78020895690.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_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 5320 bytes
SHA-256: f0631931625660016c4d3db7e8f8f716d290ceb1d5273f338b84e3917ef37525
font_01_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 10624 bytes
SHA-256: fb99a1e674a28fc46340f8f466e343b3efed3cc11d17cf1294904f8fbd3028bf

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