Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fda1342ad894789…

MALICIOUS

PDF

59.4 KB Created: 2020-12-19 00:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 56511e46633f149a40a90b9f7fff42f6 SHA-1: c3bc3396ec23745d631df9e95f32322a1117d97b SHA-256: 7fda1342ad8947892f94709aa7ecad59e0ccf8ba3edd6fa37eee36fba6de101d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to a school calendar, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=east+bridgewater+junior+senior+high+school+calendar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407782/normal_5f92b3358361a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_5fd6fb2fcdad2.pdfIn PDF document text
    • https://wojazaxu.weebly.com/uploads/1/3/4/5/134589930/37a83372dd89a71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f93a641f09ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420756/normal_5fc838837b7c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_5fc1d359ebce6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409095/normal_5fc6fff1c8a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501037/normal_5fd9a1827e646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dba3551-79ec-453e-976b-3521337e4368/dusokavemefud.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/birdman_book.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/concrete_basement_wall_design_spreadsheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e006a879396864083677/t/5fcb5edb1ef6d1662fed97e8/1607163622479/98250345019.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_off0000abd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD0 5464 bytes
SHA-256: 8d628061476f71a3a04a5fa26ba0407280bb22e4b1bfe92ccce1c38b63142dd1
font_01_sfnt_off0000be74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE74 10052 bytes
SHA-256: a3a2e08fb4983d656976b6df97f0b3dfe5cd58412a70a63281be1024e4531912

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