Malicious PDF — malware analysis report

Static analysis result for SHA-256 677337e905c109ae…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 04:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0860514cdc6462705e0e10c2b91aa4e8 SHA-1: d4f0907bf72aa89ddd4eb029e41dc52efce68e72 SHA-256: 677337e905c109aecaf1a3ffbd0d61046ff336d74f8729629ad55fdde964dbe7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external PDF links pointing to various domains, suggesting a phishing or malware distribution scheme. The file's structure and the presence of many distinct hosts hosting PDF files support the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://hjhchem.com/upload/files/fowipunotime.pdf In PDF document text
    • http://salwex.hu/file/zobatevulomijesup.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210918_063033.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/98706282.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/nutinizavumigob.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3412dbac946325e721f20147f5fe9c99/74702620104.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/42685406417.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/vipoxuj.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/87008252488.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/wazukusesoxaso.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/powowu.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/96684216604.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/78140014201.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/40005175714.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161319e43d0d43---rejamowoxinudowemeluzo.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/jetogoxusaperituloru.pdfIn PDF document text
    • https://educhina.mn/editor/files/25422354680.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/34183151645.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/60719978805.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210910112109.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/25686937780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=no+veo+videos+en+androidPDF 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_off0000cb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4F 10140 bytes
SHA-256: 69dfe72b9ebb4fe30720312d58f14ccd6a872c97bc8928b137dee4c75322762e
font_01_sfnt_off0000e217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 18708 bytes
SHA-256: 9a5d867633315ca75459b4e9d312eb1c4d95f57b6192f8c572afbb7d3accec6d

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