Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5cfe446a1a2152…

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 14:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00f4edf61ff8eec9bc07f5d281577813 SHA-1: e5a30b3ab821be16152ed276614182d0603b4cc6 SHA-256: af5cfe446a1a2152cb9fc8f2d0696facfd43f60c4975ef512a275701db43826f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful external sites. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sellmysayarah.com/userfiles/files/73439226225.pdf In PDF document text
    • http://rentaruedas.com/files/others/wumafujideka.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/garumivufekorofis.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/buxodezewav.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/u7o5dlv6vj0os9vvkp83jarq4g/26124832669.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/77610654011.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/folupokaxamovi.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/wiluxow.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/80625614377.pdfIn PDF document text
    • http://blgjad.com/upload/files/74499850704.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/fozew.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8c42b17a---pixevunidi.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210901024455.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/38517440606.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/zitinomaved.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/57046119599.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/67448639200.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/mokorerigodi.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/rotete.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/wusaxeduxurojuvufav.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/lowovijege.pdfIn PDF document text
    • http://one9five.com/userfiles/files/94636135834.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/2079203667.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/27242986783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=beauty+and+the+bestie+full+movie+123PDF 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_off0000b545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 11336 bytes
SHA-256: 6f1e6d8bdeb5dbb86ad8fdb87d2d963656dd6d61229e7d0b1dae9982a5d3eb36
font_02_sfnt_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 16768 bytes
SHA-256: a0e37f030fead096137a4cf4776bac9cd9e644f5509a1548953f32e3e581d1ca