Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95e7007c8f46838…

MALICIOUS

PDF

67.9 KB Created: 2021-10-08 04:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 81409c1815c4e23c08b7aee54099b632 SHA-1: 9a2dabb631e7321397e9d824faf022a1ef666c46 SHA-256: b95e7007c8f46838c92298b41fc388493d09ab18f2fea5e13e4b92d21adc7047
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded action trigger, typical of a screenshot-based attack. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external URLs, many pointing to potentially disposable domains, suggests a campaign to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://limsurempat.com/contents/files/wudowelategodifodu.pdf In PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/27599393802.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/40699977958.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/legik.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/xosisoz.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/nimixatuvubor.pdfIn PDF document text
    • http://isleford.com/filespath/files/20211004121106.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/16351734821.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/cqi3he5pf7hdou3qj6k4pudu6u/lozalexinupagoxatusigu.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/sivofukulawigutijuvin.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/35761083942.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/68450452994.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/37146589885.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/70550924300.pdfIn PDF document text
    • http://tillyardci.com/userfiles/file/68519532797.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/93884834476.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/73378950887.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/wirijinaguvupijal.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/18774390954.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/51d277f228326d97b19be79436f9a39c/55925355574.pdfIn PDF document text
    • http://kag.fr/userfiles/file/fuvusot.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/pakeg.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/rijotag.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/9481478011.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/49973990627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=iphone+technical+manualPDF 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_off0000afe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE7 10420 bytes
SHA-256: 27977e60634af8e0b13c5bf5580a158a07a49d3bd925595f314dd09bc523891e
font_01_sfnt_off0000c74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 14064 bytes
SHA-256: 2720ef0876252be565f60c6ad01c1c27508eed6cfa21b35913c8abde52c4ec51