Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89e50542c7032bf…

MALICIOUS

PDF

85.5 KB Created: 2021-09-21 01:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a8e95499300b6f1bdf41e44af694591 SHA-1: a4dd29d050a67b601b2fea7f420b1aca7020adc2 SHA-256: b89e50542c7032bff946726e27ed4e82172d3198efd564ca0cc4e669fbcf04f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The presence of urgency language further supports a phishing or social engineering attempt. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the delivery of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.protectakoteasia.com/ckfinder/userfiles/files/xozibanogifokaxazevumuva.pdf In PDF document text
    • http://kfoodntea.com/dataroom/file/10837960947.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/49609588144.pdfIn PDF document text
    • http://onlinevay.com/upload/files/60264624404.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/gofebep.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/73245076007.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/49924821768.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482666bff20---41789984679.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/29502719498.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/sufegafazafasowew.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/sonobapefopo.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/60622143765.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/59820402044.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/7661263891.pdfIn PDF document text
    • http://xfswchem.com/upload/files/76178687135.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/natuvizonopimuzune.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/vezazenerozupilukilopiter.pdfIn PDF document text
    • http://aromata.ru/upload/files/63109265136.pdfIn PDF document text
    • http://tano-cable.com/d/files/84242465849.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/petisiniradamiveto.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/99450788176.pdfIn PDF document text
    • https://atrax.hr/files/virapofi.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/zapepironow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+giver+questions+and+answers+pdfPDF 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_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 17872 bytes
SHA-256: 81346bf55104b5215743f6c8b77ff8edc32bd749b5181bc2cf1ea58d78598b4a
font_01_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF2 11092 bytes
SHA-256: c3f09b621f8f396ef4b81e202220f19a6e415fe834e7fbb24440d0ff6e64415d