Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfb6a767833faec…

MALICIOUS

PDF

77.1 KB Created: 2021-03-16 22:26:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 365c63175eaea9c1d201cb9fd9ee0a0b SHA-1: 7d84753150dae662d99a810f5e36ec79d583fe5f SHA-256: bdfb6a767833faecd04951146f89491b618008d6ef9f61c44c94b8025611a85e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious activity appears to be directing users to a variety of external URLs, potentially for phishing or to download further malware. No scripts were extracted, but the presence of numerous external links suggests a watering hole or redirection attack.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/123?utm_term=hp+arcsight+tutorial+pdf PDF link annotation
    • https://xatoxelal.weebly.com/uploads/1/3/1/4/131482937/3235750.pdfIn PDF document text
    • https://dizuxegukus.weebly.com/uploads/1/3/4/6/134624336/mosaje.pdfIn PDF document text
    • http://jumbochecker.com/life_without_school_paragraph_in_englishznmli.pdfIn PDF document text
    • http://interstart.online/980589642sq46j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/auto_report_bot_csgo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e06ca57e-8510-46ac-ab2e-3e4cd8f53883/26803204427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ae1832-ca52-4bb1-8ef0-093c4ce90b67/govixewuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f0972e-2395-4769-8866-08e15dbefc13/goxedewudonusulebigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379af71d-818f-4ea3-bf37-ca9b96af8f77/nidun.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/digujosaxogovevutofirif.pdfIn PDF document text
    • http://fetavuxoze.epizy.com/vidife.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/47899429992.pdfIn PDF document text
    • http://jekuranabuvi.epizy.com/avani_avittam_procedure.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/dijonuzelotofezawula.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/canon_600d_manual_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8e23fb-e4e3-482e-9d58-5785bf207f71/kisavuf.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_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 5380 bytes
SHA-256: ac67b6000d4b66563811710ad89bc407c437a2fe800a47213e99de72df895f67
font_01_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 11040 bytes
SHA-256: 71dab8c7a9a1ea275beb4cf83f7bd76fe81806ab6957ba0ebbb36e9d1292eed5

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