Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b7130f095c0484…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 09:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 401c5e5d6f1423a5a25962ad7017ad70 SHA-1: 77049ac5f89ea7305656fa09d71b41563a1cacd3 SHA-256: a9b7130f095c048461880a409f786c271b64ea0e4b1ef461dd28df2700e94937
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and a machine learning model indicated maliciousness. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's content is designed to trick the user into installing a malicious browser extension or update. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jeanthompson.nl/ckfinder/userfiles/files/11506723705.pdf In PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/86414170470.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/neramubujawawo.pdfIn PDF document text
    • http://krupongs.com/images/file/raveraziniboleno.pdfIn PDF document text
    • https://thehouseproduction.net/file/dijabumuwenu.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/41413693134.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2150cbbed---97881274091.pdfIn PDF document text
    • https://bdata.vn/upload/files/bilotofenoxusujexal.pdfIn PDF document text
    • http://tfforming.ru/d/files/60435466843.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/96402603418.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/88563729452.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/mefojulipap.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/doriwez.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/wagusupaderisixi.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/sijimiwatuvekom.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/voxafedazejofekeponibut.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/xebafuba.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/65399007048.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/wadij.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/nimigo.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/dezitexuxidikelovobip.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/40626802502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+to+ppt+converter+online+free+without+email+idPDF 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_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 17924 bytes
SHA-256: e8b5c7d5ee68e06cc897bae8be048b3a48cd34866df2b47d535efe40b403c5ea
font_02_sfnt_off000129d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 10972 bytes
SHA-256: 05a7c2a84958bf7418ddd62638bf64cc8c582c114c1613fcea8ba8cea1f404a6

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