Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5ecb3d5ba02bc2…

MALICIOUS

PDF

73.2 KB Created: 2021-04-02 17:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 472993b268816c58d14dae233d9cdba8 SHA-1: 8e43cd5e93c501265671662e49b601a57fef12ea SHA-256: 5e5ecb3d5ba02bc251fd04d7495d332954d4d94eef1207337aa143ea2528cb95
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=ncert+biology+class+11+notes+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454306/normal_6031259f919c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471238/normal_5fe302254bf99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_6012fcec94e04.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/printable_brain_break_cards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459177/normal_5ff0e3b6f2de1.pdfIn PDF document text
    • https://metidelesaweso.weebly.com/uploads/1/3/0/8/130813592/3538417.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/nulipi-lopaxoladuda-guponemogiwi.pdfIn PDF document text
    • https://jeluvuxibobuna.weebly.com/uploads/1/3/4/0/134017570/fetamawajud_fejiwobixamer.pdfIn PDF document text
    • https://pixebekisutajud.weebly.com/uploads/1/3/0/7/130775176/9186107.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/5c14ab8c9ff7.pdfIn PDF document text
    • http://zozezobakuk.iblogger.org/anari_film_video_song_tinyjuke.pdfIn PDF document text
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/diredokax.pdfIn PDF document text
    • https://gefivepuli.weebly.com/uploads/1/3/4/6/134620723/nefekekemibaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_0a975ccbe2db4c4f840d8b897e86ffca.pdf?index=trueIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_a67af79dd5604c628f196307743a60b8.pdf?index=trueIn PDF document text
    • http://fojakosi.atwebpages.com/84636165342.pdfIn PDF document text
    • http://tozoxuzev.epizy.com/minecraft_bedwars_game.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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 5676 bytes
SHA-256: 42da4a3209b785992149e7737f8838ad9a83bde48a6df71eb6054e66987a8359
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 10572 bytes
SHA-256: 43e599ea7d4e8a9289a66759c24dea8b1a825f789a8565cf2cad28f4d21aa4b7

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