Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f44d6bd74e6951…

MALICIOUS

PDF

61.8 KB Created: 2020-12-20 20:35:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8639af6be2203a6deb436dbb585ad58 SHA-1: 79aee44fe3053cc0195cc04310fedc816cc852f1 SHA-256: 68f44d6bd74e6951030c5b492299be9b5eeebc0922f46bc3e880369ce1b34272
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a site offering a "30xs calculator online free download", which is a common lure for phishing attacks. No scripts were extracted, but the presence of the malicious URL and the high confidence detection indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=ti+30xs+calculator+online+free+download
    • https://cdn-cms.f-static.net/uploads/4403263/normal_5fada37f81ca5.pdf
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fc7d6325c942.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5a919843-1479-4071-8bfc-6a041ef7bb99/wezid.pdf
    • https://static1.squarespace.com/static/5fc7a69f81da8a590db1d885/t/5fd68ebaffab5d3c56014c0a/1607896762287/colonoscopy_screening_guidelines_high_risk.pdf
    • https://s3.amazonaws.com/fifomi/free_editable_certificate_of_participation_template.pdf
    • https://s3.amazonaws.com/xiwevitox/banidigukamivorofupupuzuj.pdf
    • https://uploads.strikinglycdn.com/files/bea96f92-eb49-4e25-b31c-0a8cbb77e187/stick_rpg_3_free.pdf
    • https://s3.amazonaws.com/fedufiporara/manejo_absceso_perianal.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b703.bin
1e0d93f332275f50770a7bdffd84c9e3a275d079547cac890c3fa3b2891937fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB703 5428 bytes
font_01_sfnt_off0000c99b.bin
020f448ee4c5fa21eeddb1a95616e35f0fc736e1f38a51f354c9dcbc007a2558		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 9844 bytes

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