Malicious PDF — malware analysis report

Static analysis result for SHA-256 532cdbf12dd2064e…

MALICIOUS

PDF

87.1 KB Created: 2021-04-06 07:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 32d2826652a5d1380f05495d3b9047b5 SHA-1: 72bee60ffb861658484ba62aa152bbdd590ae4d3 SHA-256: 532cdbf12dd2064e6ece09ae08faa9c68858d77794c8c09987c37ee42fc90b1b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://xezojetit.ru/strik?utm_term=how+much+does+a+dog+license+cost PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500669/normal_6001cce969cab.pdfIn PDF document text
    • http://vixesun.iblogger.org/vermiform_appendix_arti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414866/normal_600180e96b99b.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/carrom_board_rules_and_regulations.pdfIn PDF document text
    • http://pezisafepogux.22web.org/mediocratie_alain_deneault.pdfIn PDF document text
    • http://sewatumafuta.medianewsonline.com/wipesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_6063e829e33a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366654/normal_5ff3e6ad3c6fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_28ce4915e00649208731b6ed7cb96f7c.pdf?index=trueIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_faf47837c2b7414fb6ffa273f615d18a.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_09784ebcf84c47d4b5df2c7c9217feb6.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_6566222845c446ca809d101ba7300857.pdf?index=trueIn PDF document text
    • http://jowazojulowidag.epizy.com/activity_based_costing_example_problem_solution.pdfIn PDF document text
    • http://muvabeso.epizy.com/vugoradagefijiga.pdfIn PDF document text
    • http://vedudide.rf.gd/guxulirenezemebibexe.pdfIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_dc25c04186924bfa9a0a78767eff4de5.pdf?index=trueIn PDF document text
    • http://fatebem.epizy.com/bsc_criminology_syllabus.pdfIn PDF document text
    • http://xevupabiko.rf.gd/aws_certified_solution_architect_associate.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_ae719c245eef4646bf5eea08cbad13f2.pdf?index=trueIn PDF document text
    • http://rigadod.rf.gd/dezexopirewuwotefa.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_81815b15c3464452b76442523b8981df.pdf?index=trueIn 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_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 5308 bytes
SHA-256: 1e9d04484121ffa0f2eaaf6fb9c7e4ce71036cc017f759cd6fde47891db8fe61
font_01_sfnt_off0001292e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292E 11148 bytes
SHA-256: 8ed1a4d3ac140b85830d1c91d8c93fff3c4618908e50092eb0bef11397b5e4b5

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