Malicious PDF — malware analysis report

Static analysis result for SHA-256 7583bbcecb101ee8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 09:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e01d6b94d4c7468a98c80edd59760b9 SHA-1: 3790d94fe1fe40ce6cfe6f9eb9d0885ce631c561 SHA-256: 7583bbcecb101ee8d6c6446cc5d0e4a334306ecf98fda9d100b46d5595bb6da4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02fb17b93---lewujo.pdf In PDF document text
    • https://yam-token.com/business_school/uploads/file/12476068610.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/20896902647.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/94239492680.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/gopuwarogosisap.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/44699263137.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378a0cb898e---sifomosiboleti.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/kugeladalivomanuwukamesip.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/doxametuvaf.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/48590917762.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/91626824047.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/nenalisatixewimavud.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/3133859205.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/37063940816.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/moliwujofevopumerixura.pdfIn PDF document text
    • http://sinostandards.net/upload/files/85376449260.pdfIn PDF document text
    • https://anup.bo/images/files/kavujefimiziruzi.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/77800719430.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/sijewizigizodow.pdfIn PDF document text
    • http://p-energo.ru/content/file/17528251432.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/23591208453.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/zuxirozizofiwitik.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/63836878034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+non+root+game+hacking+appsPDF 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_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 18488 bytes
SHA-256: 00b3f9fe19f4ce94059d9d7cef74d50ed043aa7d21938049c96b660225e27639
font_02_sfnt_off000121ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BA 10920 bytes
SHA-256: 92e06c443dd0b1ba70e4a11e46e631ca4ea4887542a42be186e802160bed43f1

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