Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41bb03a9f27fa79…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 02:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5261fb5d071d155ec378080e4491d382 SHA-1: 046d15d6288aba56bbc6ae750f72bd8f729ff490 SHA-256: e41bb03a9f27fa79c64ce18939f5931aece135ecec70e7f9a03f940f7c7c653f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=how+to+open+calculator+hide+app+without+password PDF link annotation
    • http://ourpreferred.com/userfiles/files/pakafu.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/mebujugefi.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/bojajosugo.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109141217041523.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/todijideraturudaj.pdfIn PDF document text
    • https://strechybenesov.cz/content/93732045696.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210907_D44B97B64CE1CCED.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/23143285056.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/giborezugotajudana.pdfIn PDF document text
    • https://novsport.com/content/File/jilesutezebupexotaviku.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jewiwekuninotonalisi.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/85696772817.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/94056157397.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/73320544980.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5ac56543---13097178373.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/xuborupokekof.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/24830411739.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/30905797773.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/59514361401.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nbri0h84f61shecmrfojgq74q5/12602820615.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/73215437007.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///boneporene.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/33467196522.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/56687580443.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_off0000afb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB1 15512 bytes
SHA-256: bd290a2e9865e26c385e811210eec2fd4254c26a37a1c9ff0261df0667a5016f
font_01_sfnt_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 10788 bytes
SHA-256: 404e1cd2a2e350cacb72de7f6dd538731dc749e1114ca9338ce2cdfff30141a4
font_02_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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