Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c7c980132be61f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-15 18:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a451429c6860b291cc910d8baccd58d6 SHA-1: c83aef2922869be2e17382f0e3459e41aff06fa5 SHA-256: 09c7c980132be61fc279774f435cedde6f14dc38c988ded50539cc7455cfde5a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure, directing users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, and the presence of multiple PDF files hosted on various domains reinforces this assessment.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=the+lottery+ticket+questions+and+answers+pdf PDF link annotation
    • http://chiangmai-esc.net/user_img/files/86435759858.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/kokukuro.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/tofifajipuromikaselomu.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/muwagogerikepovar.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/36975932925.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b7c41ac9abe7967ba6ef9b312a4cd4cd/49419791455.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/fogevubezizuxewo.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/45675819495.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/fefuva.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/3234794606.pdfIn PDF document text
    • https://ratosatu.com/contents/files/wajimupimer.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/86699113497.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/60717026666.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/24278549395.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/tusinutajupapiwuwowenemiw.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/zelivuzizonifu.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/10349479411.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb895414c---44241056110.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/rasutokif.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/83778114488.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/minemovusemutamawevupawug.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/5120532090.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_off0000ce83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE83 11220 bytes
SHA-256: b2bdde3f11d428387a34f0ab257c0e95a5cb6cf9c78d9330c94e308d8f3329f5
font_01_sfnt_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 17324 bytes
SHA-256: a2254b9ef948d918080cbdd8bb47c2a6dccb7b2d867dfcc483c890a3b5553124

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