Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ce1f8cbac7af62…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 06:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 882ba1fddcbd601076e8f64a78cc8fff SHA-1: 921231137ab9d65a51b9fc88566f36ceb065dd44 SHA-256: 82ce1f8cbac7af625ad42f04330ab35d9385c8c93eccaf835ceb6e7b13807fd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to external sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these URLs are likely part of a link farm designed to obscure the true destination, a common tactic in phishing and malware distribution campaigns. No scripts were extracted, but the presence of external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://kocavietnam.com/upload/files/gogapotesarorofapejola.pdf In PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/45558495378.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/suwiwoluba.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109011054284308.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/81187913977.pdfIn PDF document text
    • http://megalaserasia.com/upload///17188705845.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/guwolabana.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/bulibelejuk.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/4760539603.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/womobemixaki.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/tefosejusoxitifemu.pdfIn PDF document text
    • https://betsin.org/userfiles/files/92496420576.pdfIn PDF document text
    • http://prota.ru/upload/files/73299398491.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/74408098713.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/44890656136.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/wotelisabinemifezodup.pdfIn PDF document text
    • https://camelcarpet.org/d/files/59739932713.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/10395994286.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/77253981731.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/61284935206.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/dezokufarosar.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/wunebigoxipumizerisazebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ppsspp+games+download+listPDF 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_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 17752 bytes
SHA-256: fa8cc97a3653a1925fc7b2ceddc9a701ac046ae5147ac440fa01b33cedf516b7
font_02_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 10724 bytes
SHA-256: f0c838ee7b6b7a8dd69f203b3471997655e6a54aa26452f1b9ca621db61665c1

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