Malicious PDF — malware analysis report

Static analysis result for SHA-256 3647d0a663d06fe0…

MALICIOUS

PDF

71.0 KB Created: 2020-12-11 18:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 915410329756c2f45f92cce789675812 SHA-1: 77430a2faef814e4b2f40db3367fbd0293f887b9 SHA-256: 3647d0a663d06fe063ae01be0c306edb15dc19117afbe0a1cabf941e87f756bb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one identified as a potential phishing or malware distribution URL (traffset.ru). ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to an 'Aptis reading test'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=aptis+reading+test+pdf PDF link annotation
    • https://tazesarazuf.weebly.com/uploads/1/3/4/7/134726557/054d9.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://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0cb7bc819f1cf49ff01d/1606290616405/kemed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580c1956-0fd3-4e2b-8021-83976fb023fb/81753333565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a804e2f2-5fe7-4927-8d25-22f7f6db2ff3/86904110309.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e2fd6b97992eb55c026f/t/5fcae74a64036b6143826e9f/1607133002667/xusepopuzuwasil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d61f9acc-95ea-426f-b356-38d1922c6717/95490093333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a495ec67-56fe-4a3b-9718-9b43291e20fe/va_amendatory_escape_clause.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf0379ee0f32b8718a4f5/1606283320703/81813902455.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/benefits_of_aerobic_exercise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56862f75-5af6-4514-83fa-6f61b76e9f58/20290205467.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/google_email_tracking_options.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025e280e-5dd6-4a05-9c00-902f97f02ddf/fazeduwopumilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2847a20f-40ce-4b57-99c1-1c3249b1e1d8/67534295758.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_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 4844 bytes
SHA-256: a411a433b116bdfb073190c56270f2ffae53c1170f2890177037cc285b50c2c0
font_01_sfnt_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 10420 bytes
SHA-256: a58e5f6a1ef749c68939c7895b56ea45060cccc70678dd95e1b98746bb4dae21
font_02_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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