Malicious PDF — malware analysis report

Static analysis result for SHA-256 b104ef38cb04c775…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 09:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f5fdf4acfca93e266263375fcdbf927 SHA-1: a0eaf6345437883670b26e79188779f59a914c34 SHA-256: b104ef38cb04c77514e86660041d745fa03746fbcbe3dde79437c41ba32efad2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many of which point to disposable domains or link farms, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=collocations+list+fce+pdf PDF link annotation
    • https://people11people.com/uploads/File/taworugodunigalaxoti.pdfIn PDF document text
    • https://oasis-travel.ro/files/65177870192.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/24890874331.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/27153109789.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/viruma.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161391e8a09ae8---borokeluzapulikev.pdfIn PDF document text
    • https://yellowstonewildlife.com/59558163219.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/42997221677.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/labudonobov.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/14298838123.pdfIn PDF document text
    • http://sql110.com/pic/64697108120.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210914053112.pdfIn PDF document text
    • http://4bx.pl/public/file/manikoxekumisinegigi.pdfIn PDF document text
    • http://szhlfz.net/upload/13595826417.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/rafeworeferubopaw.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/wuketogagegisofalolojowek.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/5199346527.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/bezovofirazobukome.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/91932003291.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/79030833197.pdfIn PDF document text
    • http://insei.eu/userfiles/files/64476909390.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/rixalowumezebinu.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/rafewigonol.pdfIn PDF document text
    • https://projetovm.com/uploads/files/kimorinatimenojib.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_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 18124 bytes
SHA-256: 5a4b48c5ae2999587b23d91b50b1df1416d50bf6d8cd7997c8c2a3c88bc3492f
font_02_sfnt_off000117fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 10544 bytes
SHA-256: a0209db122ae982423bf8f6ebfee94b1dea81efbcf5ee62491ca7fa4c11c5b72

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