Malicious PDF — malware analysis report

Static analysis result for SHA-256 c558956ac3ecff27…

MALICIOUS

PDF

70.7 KB Created: 2021-09-17 18:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d43c2fb8e9a1498289eb96dcc9c9585b SHA-1: a460eb462c83080a9ce7e53f6bb4f72f2bc952e8 SHA-256: c558956ac3ecff2734ce5df1fbd8281751776fe532810fd51985297e1022b3aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://iccarrentals.com/files/file/17959953295.pdf In PDF document text
    • http://engineersclasses4competition.com/files/others/24961526282.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/minuparirefebanuzuzo.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/xifuwawupizixe.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf08734f1a---87010891276.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/66962053237.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/90727753144.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/93314676213.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/nosuzijikulokozamup.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/nanuperizedobep.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/14468220965.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/voxegofop.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/18904256556.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109112347213778.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/19743875557.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/75031799104.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/wajifabivamujuzemebosi.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/sozinoxaluwidatakoweg.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/denesenuxudowodadanaj.pdfIn PDF document text
    • https://rintrans.com/files/1280840645.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614418fccbf8f---vizitudunuvefiginajawuw.pdfIn PDF document text
    • https://digireg.cn/upload/mowilezizoxilazot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+know+if+your+phone+is+hacked+iphonePDF 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_off0000b530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB530 11056 bytes
SHA-256: c3303843238e2ebd4e74f4808bdae643ac6b2d997d8089b9806cb70554e360ff
font_01_sfnt_off0000cef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 15060 bytes
SHA-256: df4060eabdf507beb51b11b410daddccddc99207ad5e1e5be51df759e7fcd445
font_02_sfnt_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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