Malicious PDF — malware analysis report

Static analysis result for SHA-256 c373eec37fd2a781…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 04:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f507713708aed69f043809ad2932dcd SHA-1: 8d2249794424032d822fa4e6f69260f2a6a51be6 SHA-256: c373eec37fd2a781446b9e287c3f1391f637445916d75d17480f5e4cbc3635e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=car+parking+multiplayer+mod+apk+free+download PDF link annotation
    • https://cengilli.com/icerik_images/file/13903321651.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/fetezedesanuwofegijiveg.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/80553379351.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/dimaxijafaf.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/19008989078.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/xuvorivitiw.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614095d045e18---nedesaduxovogeg.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/43b71aa5cdf0af20245640655f76e828/lonofiratemosiwuzupuwowes.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/rominafabixogej.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/tujowekiwamekaso.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/megulokibu.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/numosu.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/sipir.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/39121757283.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/wepupudekomuxevomudasuxe.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/mexebibibanetedobosuzefa.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/gapipuk.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/filozijemegeguvotimofat.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/8953696331.pdfIn PDF document text
    • http://attlas.center/userfiles/file/53530236874.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/57611155555.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/43235482243.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/kipinamuposadetakibo.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/peteloxelijezikunu.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_off0000b72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72B 11096 bytes
SHA-256: 58e664991febc25c825963d89a7e80541bbe28317cd0ed0d916f8fb0f1c29700
font_01_sfnt_off0000d0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 18908 bytes
SHA-256: 1f5d82c0b742896651ac90b3e62313493dadcd533afc2dd31b2e88012c4f119e