Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca1b139d50d3ad4…

MALICIOUS

PDF

80.7 KB Created: 2021-03-29 05:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e1281d6cf2baaa60f61b94989cfd6272 SHA-1: 065d4d69465959c58cde8c0f244200c73202ada5 SHA-256: cca1b139d50d3ad45e52dab97cebb727df4533bc94f5b084a0939e5033457b4f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation hosting, likely to distribute malware or conduct phishing. The presence of external URIs and the overall structure suggest this document is designed to redirect users to malicious sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/123?utm_term=newspress+bootstrap+news+magazine+template PDF link annotation
    • http://donurejin.iblogger.org/zozavuvapovamewava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_601b978997687.pdfIn PDF document text
    • http://golixudib.mypressonline.com/metro_2033_redux_librarian_walkthrough.pdfIn PDF document text
    • http://fajesamosini.sportsontheweb.net/runenade.pdfIn PDF document text
    • http://kilijosizujowo.medianewsonline.com/74420379367.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5ff065d71f0cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454977/normal_5ff683837f4b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481156/normal_602cddb324f04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_603a8f96c9cbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383678/normal_60580f8f50127.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378604/normal_5fcac1287086b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_6035730709ce6.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/now_taking_boyfriend_applications.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nifibomagogov.rf.gd/applied_behavior_analysis_for_teachers_9th_edition_free.pdfIn PDF document text
    • http://nopuzowisaw.rf.gd/1371298993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2543becc-06a7-4952-aa98-0aacfe19f64c/82752760206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19616a60-651b-4867-a0c0-615f795472e9/diwolexosaxotujegimakor.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_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 5392 bytes
SHA-256: f5186263abfb86881d84fba8df4a352c0e4cbf0ea713ea8d60deb308e4cb23fd
font_01_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 10812 bytes
SHA-256: 9306b62cc5135d67bb9eb3e7ddb7c907909fdb3fae0295d0ffaf17d9f6087157

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