Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c454b26ce545cdf…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 04:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7756cece5b3e415e1b0f1a6c7f05d7f9 SHA-1: 6a3991d562020d95ba27fe13b407a309b14eaf68 SHA-256: 0c454b26ce545cdf4ecf99c0dac6fde72fe7361892ce6ef35bdd6f2fe35b283a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm on disposable hosting, with numerous URLs pointing to PDF files. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it's designed to lure users to malicious content, likely for phishing or malware distribution.

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://tavio.ru/files/file/mefajetedi.pdf In PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/xizokirezodifarudiket.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/10378158579.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kafuxegebibasolopofipogaz.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/36818910457.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/tagatigu.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/40332547299.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/62201500944.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/vudiwuxitavepivo.pdfIn PDF document text
    • http://www.andreapondika.cz/file/nalepolorijado.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/relakukowo.pdfIn PDF document text
    • http://www.centralperdana.com/file/nesadebulodar.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/53724202622.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210909140427_1230401653.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/kolaw.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/xujan.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/tekuzidulumig.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/xidabuv.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/33189989669.pdfIn PDF document text
    • http://axwelindia.com/uploads/favuf.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/vetataxuw.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/32636982269.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/xawajaru.pdfIn PDF document text
    • http://contua.org/userfiles/file/sarikuzevenaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+chemical+formula+for+cellular+respirationPDF 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_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 17592 bytes
SHA-256: 1f47e2ab576d247382dabd306e41d9251b49e5aacace64eddb30651085f6c33d
font_01_sfnt_off00011226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3D 10808 bytes
SHA-256: 8341fb95e68552a06b8d835227e86343ad8aaf976c856a215e35528e4b82c814

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