Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3a711d2f15e791…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 06:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 866fb017cb0c41d108ae6e6a0c728016 SHA-1: 30f8df3da0a1744b457932c092783035a69694b6 SHA-256: 5d3a711d2f15e791ed1bababbfef432330ddc06b046a0b043ff2c630aaaed7e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 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://masini-de-ambalat.ro/images/userfiles/32896062127.pdf In PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/83061701345.pdfIn PDF document text
    • https://regenerateacademy.com/file/wugagefu.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/tupatuwote.pdfIn PDF document text
    • http://chromoink.com/updates/file/benuvukij.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/807381da732962e5e6e1e5a78186f7a8/26304741223.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/87581739383.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/50371676760.pdfIn PDF document text
    • http://msiutilities.biz/documents/65314080901.pdfIn PDF document text
    • https://senegal4d.com/contents/files/lanoxurabanebirukumobo.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/regivubefujujawuguvijewux.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/72683210012.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/tovemupozixadifuxuw.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/6269257146.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/52939597610.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/21964868407.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/76866392483.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/pivapige.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/85548052235.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/reziwurona.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/vokilowumuwufofibukudop.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/57293127323.pdfIn PDF document text
    • https://agatanorek.com/files/file/puwuvirovovob.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/38436869664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=jaka+jest+najnowsza+wersja+androidaPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 18396 bytes
SHA-256: c4388f853f0923e1778539b95a2d0040fa97505507c431d6c81a3f5cf9ce6ba6
font_01_sfnt_off000113bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 10556 bytes
SHA-256: 851158ea5afe89c24c0ed6e5a4b311abc99c50b8bc424545a9d300ff5d14fa45

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