Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f65c313497ace4…

MALICIOUS

PDF

68.5 KB Created: 2021-09-12 02:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7dfb86660cc9f94deb50d1cae7f4ce76 SHA-1: bde726974c2d97628cf176ab2a39a426c8bead51 SHA-256: 33f65c313497ace4c352e245ed0783182507cf213a49f6dc344aa02b005b7a22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple distinct domains, which is a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous unknown URLs points towards a potential redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://keralastatetailorsassociation.com/userfiles/file/ninuvonimalusob.pdf In PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/80955247054.pdfIn PDF document text
    • http://sjhtractor.com/d/files/2489082033.pdfIn PDF document text
    • http://ciskmv.com/css/file/71010288346.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/25268156699.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/11063388770.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/83706278535.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/15048193398.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/11511731178.pdfIn PDF document text
    • https://siroyensao.com/upload/files/jewutulamajixoj.pdfIn PDF document text
    • https://stvorki.ru/files/file/gutokuzepukobuxuxuwawuj.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631396039.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/44465982497.pdfIn PDF document text
    • http://hkacca.com/userfiles/gonapifapebur.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/70818971019.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/jelorebetix.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/14978846727.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kemuwapit.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/jatabosazexel.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/22091510137.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613126936c694---bemosowape.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19c180279---wozesusimolaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=desire+2011+free+moviePDF 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_off0000adec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEC 15568 bytes
SHA-256: 8e72dc761a90cfca19f81d323d1a3770f00f671e06003e2036beb08bfc1e5152
font_01_sfnt_off0000d5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 10328 bytes
SHA-256: 7ac50f42d977e97c7c12ba477ed97985966c1fc1621b888414655577866f910b

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