Malicious PDF — malware analysis report

Static analysis result for SHA-256 76936026e51804df…

MALICIOUS

PDF

69.3 KB Created: 2020-12-09 12:17:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 37f0d5f1ffd92ebee6f22952278d629a SHA-1: 1192d7ca3c79216a33ff3c4e2feb70b18c39eabe SHA-256: 76936026e51804dfc110e20fbb784b51237d42d2b9f27224c1a52c472cbadfff
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier also flag this file as malicious, specifically as a phishing trojan. The embedded URL 'https://trafffe.ru/aws?utm_term=lesson+plan+for+substitute+teacher+template' is likely used to redirect the user to a malicious site, disguised as a lesson plan template.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=lesson+plan+for+substitute+teacher+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f875714c9aa2.pdfIn PDF document text
    • https://zisogojevup.weebly.com/uploads/1/3/1/4/131453725/tutokarisiv_tefizenoj.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/2396999.pdfIn PDF document text
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/bofemivigata.pdfIn PDF document text
    • https://jitedamanun.weebly.com/uploads/1/3/4/6/134627504/9272669.pdfIn PDF document text
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/5463175.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/veraxawewib/riwiluzowotopemilanavamug.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc292a4e5c7695ca9a65d9d/t/5fc68fedf81c9a2a0c891b8e/1606848493791/kavozoxasezazuzuve.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1d2da12facd59ceb37db7/t/5fc542612dd96f59189a0724/1606763105670/new_berlin_animal_hospital_new_berlin_wi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b955be9b6939512bdb09/t/5fd076d15efba8153b248b43/1607497427400/56846558490.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/70104132492.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc383e42cf09257bd7c65aa/t/5fc894d9e101942bf7747e34/1606980825081/worcester_telegram_and_gazette_news.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b498e9fc3622d52dc1d8/t/5fc683fff3de5e49b547a721/1606845439981/uefa_champions_league_channel_canada.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_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 5336 bytes
SHA-256: 8c2e00786c27e5215331b8c93ee9490142f8f4916b1e4c63683e49456dfa1dbd
font_01_sfnt_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 10892 bytes
SHA-256: 9822c8d2dfb43c2f5332acff525b363795f7df6d163fa4a6bc97241b464ef658

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