Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ad137c05a0d59a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 12:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d6f9e1b1a7a19a8041fc4d21a8bb3dad SHA-1: 39b1c9135f3ceb78541113528cd558050fbc01ba SHA-256: 92ad137c05a0d59af918bc8c5e8f3bf669ca8ebf417acc385de187ce5852182a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured to appear as downloadable files, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://fleshlight-tw.com/userfiles/file/19689148132.pdf In PDF document text
    • http://fireprovietnam.net/luutru/files/dujabopesenesef.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/dagajozajanise.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/60478639636.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/57903932554.pdfIn PDF document text
    • https://coevent.ru/upload/files/43869212772.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/9807622082.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/329952202.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/9318274367.pdfIn PDF document text
    • https://iwistw.com/upload/files/duzuxeseravifofi.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/37496965651.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/22217909957.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/jubobolovolowarorexitu.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/putoja.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/rixataribopetesakuzaloda.pdfIn PDF document text
    • https://verner.lt/images/files/kawilemolaxitulavu.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/11091969177.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/92974914694.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109030837079557.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/51697806893.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/59748306786.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/33851398553.pdfIn PDF document text
    • https://bselink.com/userfiles/file/ladudafaletokanurolos.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/7610002907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=play+store+apk+smart+tvPDF 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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 10488 bytes
SHA-256: a3044e8493460557d8c2550136113e0476bc83b8116b131eb622cba97d02dcc4
font_02_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 17320 bytes
SHA-256: 21ac1c332a062c171ea5d682e0b2cd478d93d404adc44802e8d3efb553ec7764

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