Malicious PDF — malware analysis report

Static analysis result for SHA-256 853617be40cdf899…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 18:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0662cd6377e09d4ed32eadea4f3163a SHA-1: fa774ed522a1f377dc2051873fe4aed7933773c1 SHA-256: 853617be40cdf899fb035e26ae50e1d4e6414d72dae3673028c6467cc6802115
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The presence of multiple external links, including one identified as a link farm on disposable hosting, suggests a phishing or redirection attempt to a malicious site. No scripts were extracted, but the overall structure and heuristic firings point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://canadianartistic.com/userfiles/file/55814226901.pdf In PDF document text
    • http://schokozentrale.de/idata/37756698334.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/dumexuferogiluvananige.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/jamipevovelaberesafuxi.pdfIn PDF document text
    • http://trubaopt.ru/content/file/mijobatixizevikiwika.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/dikasivojugomebelot.pdfIn PDF document text
    • http://onelove.cz/file/jetogefagubodesodoxuwuja.pdfIn PDF document text
    • http://quetthe.com/upload/files/mapor.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/99602486951.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/lilenadegomugewesufawezi.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/77483993212.pdfIn PDF document text
    • http://www.siposferenc.hu/html/sasugazovun.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3e24627de22170a0f04759182ec46abc/38559821332.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/jujumal.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/701931790.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/13371207752.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/58439573473.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/61172251903.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/38190348728.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/sabofabifigipulukaseja.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/xolinasal.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631553343.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/pojizevuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gdmss+plus+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_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 17296 bytes
SHA-256: 7a26d08507c2710e56f8b75445e966fa9544c7b41936ff0211317aba572fc8ba
font_02_sfnt_off00012e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9D 10464 bytes
SHA-256: b6091aeaa61c5d576f46cb468a2ffc9330d9cb00f183687276f1011d73bc822d

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