Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ff9cf6f1fd3b2b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 07:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0e26c9077dd64a167f666139f5601d5 SHA-1: 9fa55a8e5b70b2abc301af1056b8418fd83adef5 SHA-256: 75ff9cf6f1fd3b2be8daaee7b3222db1eac77a3207f4f74c5031b671c10438b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is described as a link farm hosted on disposable domains, indicating a likely attempt to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://allytemp.ru/uplcv?utm_term=tricky+iq+questions+with+answers+pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/abhb4hmg751tfckjr0ptvi6qbp/45082783623.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161364b959234d---84028406122.pdf
    • http://tuvanluatdanang.com/upload/ck/files/pibozevif.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/71279621397.pdf
    • http://studioagm.it/userfiles/files/fewarubi.pdf
    • http://fsanaq.com/upload/file/210917021858154921g2evziofr6a1.pdf
    • https://dtd.com.pk/ckfinder/userfiles/files/nuzab.pdf
    • http://paoladebenedetti.eu/userfiles/files/tibekanujokebewowuteket.pdf
    • http://refinerlink.com/userfiles/file/feronowom.pdf
    • http://lexxyin.net/files/fckeditor/file/69860220115.pdf
    • http://alrabbanoilandgas.com/file/files/46039057672.pdf
    • http://weilandvloeren.nl/fckimages/pewinijixoduxavebilez.pdf
    • https://macjiboter.macjahisa.si/files/file/50771846135.pdf
    • https://fleschimmo.lu/userfiles/files/pufukijepugepomejov.pdf
    • http://digitalpolicycouncil.org/imagenes/file/bovinidizaverab.pdf
    • http://cesnek-vysocina.cz/UserFiles/File/38411335546.pdf
    • https://questyme.ca/userfiles/file/28541670623.pdf
    • http://tcyy88.com/userfiles/file/2021090200591973499.pdf
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/xovinetimoroseg.pdf
    • http://capitaloffice.pl/fotki/file/20484076083.pdf
    • https://radio-clipa.ro/userfiles/file/siteje.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/fareguwufe.pdf
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/90548526806.pdf
    • http://sichera.eu/userfiles/files/89267720527.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/turexekenubifegixowo.pdf
    • http://mercuresamuichaweng.com/admin/file/worunoxefef.pdf
    • http://teusz.pl/UserFiles/file/dujuw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 16792 bytes
font_01_sfnt_off0000f1e0.bin
8ee0c616eec485a9c093392889434749be3149344b81963a483c5df198fdbebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 18404 bytes
font_02_sfnt_off00012137.bin
191bf91add229043bcce880682c18327b53be8e43e9fcbcdf332173e99dfe13c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 11172 bytes

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