Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d1315d06f38146…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 09:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5e23dfac93085e259f2cb7049517bf1 SHA-1: f0baa5f3c993e648c2169998f06263d426702609 SHA-256: 72d1315d06f38146676ee695dbcf1ca665238140289542a3e4b4ec9a234af091
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs designed to redirect users to potentially harmful content, disguised as information about Android video editing apps. No scripts were extracted, but the presence of many external URIs indicates an attempt to lead the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=best+android+video+editing+app+free PDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491e4574507---58232768057.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324a58ccd9f---nefavakowolakokipumi.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/xobisovanilatotiw.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/pafotol.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/goxina.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/13893416757.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-6/20210906101111511631.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/45127211307.pdfIn PDF document text
    • http://heizler.hu/files/file/73420835921.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/nidobo.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/14519503310.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/24323522520.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/57527789999.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/54088563573.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/33807316995.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/98986790772.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/famagefufuboxivelawu.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/puzex.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/vabenabewuluduvug.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090404282573499.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/74374853469.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/52125181061.pdfIn PDF document text
    • http://demkapi.com/resimler/files/93872864987.pdfIn PDF document text
    • https://pindimana.in/uploads/file/jititarajosekavumanuvajir.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_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 10748 bytes
SHA-256: 17f298d8e209049918d9c585feed0fc689d98a2a529ac81a94d11cb28c354909
font_02_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 16732 bytes
SHA-256: d779cf0d2535561da7b824bb9c5d30c110db3e6919411c80b5d9595a5ade0717

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