Malicious PDF — malware analysis report

Static analysis result for SHA-256 d492caa8455a5a82…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 20:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3daa0e341d1523b19aed233879f4ea4 SHA-1: 957363c5497e585072a2ab29a7b5a9b1a4320816 SHA-256: d492caa8455a5a82106b9b83966fc52f4e060e4ec1ff42f17b044514f92ae245
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an intent to exploit users through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://crysiq.ru/uplcv?utm_term=danganronpa+season+3+anime+episode+1 PDF link annotation
    • https://brihat-group.com/assets/userfiles/files/11770963887.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/mikapozexipabagonepatik.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/4230256690.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/ripunikofujusefafufikidur.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/85476429632.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/1628620840.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210910/16312466426567.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/widaruzof.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/50776730713.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/zutizamadid.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff13e15e0---5122099157.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/53017218932.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132e59b9f8c0---30168455531.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/67648898171.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/goverolobeba.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/5660064634.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/86236837772.pdfIn PDF document text
    • http://kdekdyjak.cz/data/goberiwozipajix.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a5d61520---gumanitejetopemi.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109120201338771.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/97675955600.pdfIn PDF document text
    • 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_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 10816 bytes
SHA-256: 9694dddd9af3610a9555501bf926ead42587f9ed2d4ee8b9e54fc428022a309b
font_02_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 18404 bytes
SHA-256: 16ddd53ab72c7e6068439d4ea15a97a39378820aac7aa66d3581b31943c944a9