Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b8282988c08f0e…

MALICIOUS

PDF

106.7 KB Created: 2021-09-09 16:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1405734cd760f6727fd16dc8225d69fe SHA-1: fad4607b19fe0330bdb5854ab4cbb10a102aa4b3 SHA-256: 19b8282988c08f0ed5d122330281e393131eecb0e9ac8c2f5f922572b99fdc94
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://podwierzba.eu/ckfinder/userfiles/files/zefakivexobali.pdf In PDF document text
    • https://luminex.pl/upload/file/nufobifi.pdfIn PDF document text
    • https://mmtours.si/uploads/83039123715.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/21339263715.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/48347579548.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/75017480790.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210908121538.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630690908.pdfIn PDF document text
    • http://contua.org/userfiles/file/fosan.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/80198518745.pdfIn PDF document text
    • http://bptramptour.pl/files/file/26662594568.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/pesamunejidifa.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/navewoxadelatam.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/zonibumetebimivuwulamulik.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/83828381622.pdfIn PDF document text
    • https://cardolf.ro/files/39939125121.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/8080668730.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/3425119807.pdfIn PDF document text
    • https://angkalaris.com/contents/files/63457798954.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/64271192159.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/66419286181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=twilight+breaking+dawn+part+1+pdfPDF link annotation
    • https://b2cdemo.tickets.com/content/files/60480323015.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_off00013c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4A 10820 bytes
SHA-256: 666135da27f0e7c5db0c60ac6eed6c213c7521198e44975cf032583e24ab0588
font_01_sfnt_off000154d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D0 18500 bytes
SHA-256: 375aa6e73815bb95821b9ece84e594cc7fe918de2bb075825f84653c4ba656ef
font_02_sfnt_off00018500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1