Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b8b5b4b6a11bc7…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 19:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 05336da80311b3c871847584a4c54175 SHA-1: 40705d541e40c8abc09a925b6cb3a97862494d35 SHA-256: f2b8b5b4b6a11bc7b205c25a69d930dc81fd85f01cabdfad75188cfc7f7cc75b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for SEO manipulation, which is often a precursor to distributing malware or phishing content. No scripts were extracted, but the overall structure and heuristics point to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://culfordequestriancentre.org/UserFiles/file/93684357414.pdf In PDF document text
    • http://caythuocdangian.net/images/files/napezutigefosif.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/95176400438.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/16821335252.pdfIn PDF document text
    • http://autovoda.ru/upload/files/dapunit.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/wimokidatig.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/sazifijoruxeza.pdfIn PDF document text
    • https://intersat.lv/files/file/gibawugavanazaxodut.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/sigitososamuxaz.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/xogevejofivuko.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/bowesonorusivewesuf.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/wugolufupo.pdfIn PDF document text
    • http://technocom.pl/editor/file/28349458552.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/fiwosuwe.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/sejos.pdfIn PDF document text
    • http://apicn.net/upload/files/61777129876.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/zawawinevebovudezerimodi.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/popelibafaporedazedovekit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140beb157c86---82589927939.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/32574954234.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/61078552356.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/1180859527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=one+gsm+apkPDF 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_off0000c00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00D 10256 bytes
SHA-256: 5357df1d9b444d650c04e74d4fc21555e916d9c393735de6e87aaa108d3b1d00
font_01_sfnt_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 17448 bytes
SHA-256: 766b2c271de71b8f6db0360a22a64bc7593fdc945e52ad7bd32746e89e4dab40

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