Malicious PDF — malware analysis report

Static analysis result for SHA-256 44836e426e782d3a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 05:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5183de876eb350a3c728b1482cf34d2f SHA-1: 5c0fca326e8e1007b74e84d961b9037a540fab18 SHA-256: 44836e426e782d3ad6caaa3c0703e4d520045dab340d2894d866ec76843bf105
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the nature of these links.

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://raffaelecavazzoni.com/userfiles/files/purisudonogorepivozafes.pdf In PDF document text
    • http://www.parinet.fi/tiedostot/files/43934007959.pdfIn PDF document text
    • http://marymo.ru/uploads/files/96688188927.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/53455031452.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/bisigokimitazusuwegigega.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/4360146895.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/faferitozinenaz.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/50556782414.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/zusivoxabebapevime.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/ligon.pdfIn PDF document text
    • http://offerparts.com/upload/files/pepuvudovitemuzegodagi.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/lejipetomemetig.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/86044147447.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/vilomilubudedozofuru.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613332e058c99---vixojaru.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314cf58d8f9---jumaturalokedotuka.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/74368203614.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/66555727151.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/46654070094.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/80697149683.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58535850246.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/23266884573.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/perogixusife.pdfIn PDF document text
    • http://www.bash.cl/media/file/vukipanupase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=name+id+app+for+androidPDF 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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 18056 bytes
SHA-256: 52f65bdbc09dd028921f6896723b3eea8e4d89e319c74b1c7e38b0dbd4dd17da
font_02_sfnt_off00013057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13057 10324 bytes
SHA-256: 1f1423bf8cedcdf82ab7231f0978ef34339735e653b6d382e1309b7caf0ab484

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