Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd89076d7a55f53…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 18:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f4c71bbee0446db8e17f449b506cf54b SHA-1: 3330c10bf9ffad03b73404037026a3cacf6ff0f4 SHA-256: 1fd89076d7a55f53b1db039ae924c63d082448b1e7ac67418ce9e29a05c85664
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to external sites, suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for links, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://regmac.net/userfiles/files/7617803211.pdf In PDF document text
    • https://2acontractor.it/images/file/loferelepa.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/72702498113.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/53919943573.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/34840095863.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/gulib.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/23241777710.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/desewakazigexud.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/25197188664.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/weparemevedelezaki.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/melexataxo.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/85731381587.pdfIn PDF document text
    • http://prograsifkalip.com/files/talipawulek.pdfIn PDF document text
    • http://modero.vn/upload/files/moxupopisusigikirebu.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/vosuxagekixadiwejediruvuz.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/1014297578.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/65361121828.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/4605276945.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/48204197381.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/16177631133.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/zovodenudo.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/pipezozusetuwawo.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/navadikazoj.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/65053993293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=kindle+oasis+manual+pdfPDF 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_off0000d561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 10552 bytes
SHA-256: 2fe7b67d5cbff18aab9eb4a790aa4a78b9a205b485046e590594b7986286e704
font_02_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 17360 bytes
SHA-256: c8bd8580887f2c962891c49dd689d47b721ae3fe44ccf41cb3b174eb6776a010

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