Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd99ff443cb7d66…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 12:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b0263369b2d6a6bf2f1cb1a53a96542 SHA-1: d010434331426fe58e49548478922f045671d1bc SHA-256: cbd99ff443cb7d66a94647914d300ccb3dd9eb89ed10bda34d3179a400e32e23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/xumoxewutekejizeb.pdf In PDF document text
    • http://qdjshg.com/files/file/xaribojijowofeb.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/38274617751.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/miramoburekigof.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/sobokuwenuw.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/forawal.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/wasukaf.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109111901416442.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/80198328269.pdfIn PDF document text
    • http://splogservice.ru/content/files/purefotesovosapafik.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/5091690212.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/53006140409.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea8ecb94d---sebirogisupel.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d6d60e0e---64813123156.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210914061633.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/sogabopuvikegijasipaga.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/6857966971.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/68285339772.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/70096459841.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/82632920227.pdfIn PDF document text
    • https://novitas.ro/files/15216152883.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/35620604041.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/419743758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ultimate+fishing+simulator+hackPDF 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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 17208 bytes
SHA-256: 28cf2d68a560d9a7f240d477fe554d3cf59633eae152e1476a5c7a9a43fcb87b
font_01_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 10980 bytes
SHA-256: ddfed45ab6de65160eb7b747d2dd8e5501fce79e5e16b498587708e48f63d921

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