Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c55240b7a78bd9f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 10:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d98807813bde05768b90209b01218f2b SHA-1: 9d6820c3f215dd0d7e67a88502cd010d0c2a6c74 SHA-256: 5c55240b7a78bd9f7de4cf08ca60265d8a05f28ed5f7100435df87744861f617
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on disposable domains, indicating a link farm or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=youtube+to+mp3+converter+android+apps PDF link annotation
    • http://obasekiestates.com/UserFiles/file/gajinejolota.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/97901493338.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/79271749472.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/bedopenudepeluximoriv.pdfIn PDF document text
    • https://ibericadearmerias.com/file/20176284847.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/katanajarogijuzubasam.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/66719019548.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109161551319972.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/59893902807.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/56881632039.pdfIn PDF document text
    • http://origo.ws/userfiles/file/58174479635.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/73203330974.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/18919198791.pdfIn PDF document text
    • http://iknow.pl/files/file/37623110125.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/38970494772.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/pagegufixosokokagoxexug.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/81695078004.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/retoterakipera.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/bexurozineluxiregazetuzoj.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210904035100.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/golemepegomazuz.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/49656612217.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210906181517.pdfIn PDF document text
    • 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_off0000d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 17304 bytes
SHA-256: 5fd68a89e0857954329b93869362108fa9adfdf7f98529de2da740f707ac776e
font_02_sfnt_off000118c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C9 11088 bytes
SHA-256: 0373f1d8287f543e46b2ee5e486232377208407e6cfd86e46a0ec93c3d1d48d7

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