Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01816b41cdaca8b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 12:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7e1a0a664b7ff1d852fd436c1f6d608 SHA-1: bc3def41f41dde96fd574042d704d650c4e96fa0 SHA-256: b01816b41cdaca8ba2e408b709f5635b4fa26e15851079041a6118ad2d70dd01
134 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, with one specifically mentioning 'ms office 365 pro plus product key', suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rougezenekar.hu/files/file/garutogogudelijevof.pdf In PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/xiviwozil.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jutipenutek.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/54716164949.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/femuwilugasugofo.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109040909228036.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/bonojade.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/vadaxebezusudatun.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/34908522771.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/36182623365.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/zanigujabu.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/xiwekafaman.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/kiviratekipagejekeforat.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/kifezetomax.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109011759391709.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/jujusikoxaragegu.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/24098282159.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/lopizobezozewobudikumipix.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/98706021708.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/13911441808.pdfIn PDF document text
    • https://digireg.sk/upload/79807596389.pdfIn PDF document text
    • http://wixoon.hu/upload/file/11068645374.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///bixug.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/73394624316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ms+office+365+pro+plus+product+keyPDF 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_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 11120 bytes
SHA-256: 867dcde1d3431eae2cfa5db7cd4b4df451fd8700d4d1822d5234ce2ccd0f9be3
font_01_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 18416 bytes
SHA-256: 15bc1eb9035256cbb6766cf85faf245b2fb654b6aa94298b71ac4d2b7973f66f

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