Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb065f4dc2010e91…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 03:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ddd1ce59c41fe58cb3d27c4ec9c7ae0 SHA-1: 0c490389b884439fe4ccad06f0fff27ea730abc2 SHA-256: bb065f4dc2010e91a30bf13975b36d2e85296274e2a10e383d5fa86a70994e3b
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 embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ziva-muzika.cz/files/file/71017763089.pdf In PDF document text
    • https://pisausakti.com/contents/files/93678418599.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/36340799588.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/35813896986.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/47229236867.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/funobopikirewagisetig.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcb66a4131---tafusu.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1632305595.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/jekotasaridunolipepol.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/29983872756.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/58058939969.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/18962706497.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/nuxefoxepaxoroxib.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/lewiguz.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/kinotexijewamisal.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/jonaj.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/satinavuloxifezuwiluvud.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/roxokes.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/jukupasinutowekaruxuzuwoz.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/89207141434.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/eac9aaa015d623524b9a59145ad84092/wupibolaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+convert+string+to+date+in+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_off0000afb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB0 16624 bytes
SHA-256: 32e593c9bcf32ed52c5377ae38fd8911b423668dff78c41ac74e1f772180f87b
font_01_sfnt_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 10644 bytes
SHA-256: 0de1f370575396afa5248b3a4d8be73bb73046273f02c4d8217d52e3f047a48d

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