Malicious PDF — malware analysis report

Static analysis result for SHA-256 933374c437b0e880…

MALICIOUS

PDF

65.6 KB Created: 2020-11-18 02:16:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 05798783734087bc3f5b49db39dbfdf6 SHA-1: 25a846603e245b87f22034a443d52f8ad88eee0f SHA-256: 933374c437b0e880531dec64d63eb393e5f57bb0f303bdb0eb9474419b7c8b9d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://traffking.ru/aws?utm_term=10+business+analyst+performance+goals PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451744/normal_5fa41cb20611a.pdfIn PDF document text
    • https://somuwozav.weebly.com/uploads/1/3/4/5/134525430/9248434.pdfIn PDF document text
    • https://kafubururi.weebly.com/uploads/1/3/4/2/134235359/1282775.pdfIn PDF document text
    • https://guromofir.weebly.com/uploads/1/3/4/4/134489627/2839233.pdfIn PDF document text
    • https://lugafowak.weebly.com/uploads/1/3/4/6/134647172/3569708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5f93b6ada5ae3.pdfIn PDF document text
    • https://pafazemewo.weebly.com/uploads/1/3/4/5/134517711/3643841.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/javixanupudura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414515/normal_5fb2d5bc36123.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/leguvefu/monuvinizedad.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/calicut_university_bsc_computer_science_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/all_star_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/amazon._com_mytv_enter_code.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/lenovo_thinkpad_t540p_owners_manual.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_off0000c30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30A 5676 bytes
SHA-256: 0b81bff9e62c3662e2d66cd10c7c88d0bdf965f5a4d8f1ef648b91bf9504d735
font_01_sfnt_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 10352 bytes
SHA-256: 5ce5a1bdef2578415069fd634feb131c90683c4373dbb574d961b742b4515945

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