Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f594ad6804a7be…

MALICIOUS

PDF

73.5 KB Created: 2021-03-19 20:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 13d6a57ee29f11bf301b47f63d1d87f4 SHA-1: 50f148a458195735633dad64c6afa632af9a7a25 SHA-256: b3f594ad6804a7bec499d150d400aa7480cf5d20f38477f7488ba475dc434142
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://druttle.ru/123?utm_term=esc+guidelines+ventricular+tachycardia+2015 PDF link annotation
    • http://majexifavel.scienceontheweb.net/stock_market_open_tomorrow.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/characteristics_of_computer_network.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419452/normal_5ffc00f8abec5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417033/normal_5feb928ef1e5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404133/normal_6001593de226b.pdfIn PDF document text
    • http://xarapover.mygamesonline.org/69960606409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_6054025c76b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_6052277fc2e8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386334/normal_5fdfda066dc5a.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/saduko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinosizifaxuful.epizy.com/xopesosavu.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/describe_what_elements_of_arts_and_principles_of_design_used_in_moriones_festival.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/58806840412.pdfIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_2ddaab7af39d4d37833f177ef48d0346.pdf?index=trueIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_062804d0fd2a4b698577a667ae61a27b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/kojotojirosikisa.pdfIn PDF document text
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_f3c0518f0c414db3852d5ef582718bc8.pdf?index=trueIn PDF document text
    • http://zujugefov.rf.gd/18111902249.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_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 5772 bytes
SHA-256: aeeb41aab6f4eb694f380895d7d677ff93e835a20e6ca17469893300d836eb41
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 10840 bytes
SHA-256: cd57057c852ef1fe3b7d8f23951c9fc9a1b9d77ecd5926d76596e23454432e64

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