Malicious PDF — malware analysis report

Static analysis result for SHA-256 761b6064b870fbdf…

MALICIOUS

PDF

76.5 KB Created: 2021-02-15 05:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c1261f6b205ce54a8f2ca3c29feebdb2 SHA-1: 1c819a434ad1e61e6d325ae583ac3f26d8d2fa92 SHA-256: 761b6064b870fbdfd60e199b7e8db9936e12bbb0cc9ae93c243b8a6217934d19
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, masquerading as a helpful cheat sheet, which is a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external links, including a link farm, suggests the document is designed to redirect users to potentially malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://leonvi.ru/aws?utm_term=physical+therapy+cpt+codes+cheat+sheet PDF link annotation
    • http://creditscoreusa.info/vaporwave_city_wallpaperxv4l6.pdfIn PDF document text
    • http://varistop.site/net_framework_1._1_4322_windows_10zcmue.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/c01MPjb/ferijadovovezimifal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_6029dabe57b71.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/1413224.pdfIn PDF document text
    • https://lifulufo.weebly.com/uploads/1/3/1/3/131379971/ritefeguz.pdfIn PDF document text
    • https://cdn.sqhk.co/woviwefi/ibjlWji/7291909008.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/serogajugomiji/control_circuit_of_auto_transformer_starter.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/bridal_shower_invitation_cards_free_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/13215126037.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/integers_worksheet_8th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/tawawogume.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/basketball_scoresheet_fiba.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/filing_false_police_report_nc.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/kakosumezumiwi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 4948 bytes
SHA-256: 1485053e0c0ffe4a0650db98c70e3b95499ee419e493ced54562fa3fef8a0997
font_01_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 11308 bytes
SHA-256: a59eab13a3406fa87f656e40337d6fe3ef0bc6c3f00a937c7f05539d41f65651
font_02_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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