Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3424e717e7f48d2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 14:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92d8d4c36f5a7c0637450c2aa83f784c SHA-1: 7b8006f9dacda4109bd5c00dc7d47d8697d026c9 SHA-256: c3424e717e7f48d2dc255a4d2ec12473c406a12f7bdb0ce02023f0aa584bea71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a pattern of using disposable hosting for a large number of links. This suggests the PDF is designed to lure users into clicking through to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://slenderclub.cz/ckfinder/userfiles/files/75098270349.pdf In PDF document text
    • http://2ds-creations.fr/userfiles/file/33736714602.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/kotodulolozusilu.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/88709805232.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7389b420ae1ae5b6c16270047773eeea/ruzuwadibiwiburimugiji.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/28408250164.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/bojokudixezegivavowizos.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/84420571940.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/bixujatururigavekeve.pdfIn PDF document text
    • https://miet.hu/kepek/66633304932.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/bibewironelerakewesaref.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/sokejururefafe.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/vatudowuvi.pdfIn PDF document text
    • https://webaprint.be/img/file/bizusatixexodirisadubube.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210909030001.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/3816417421.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/worenavomudoketatejis.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/dixan.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/putegadofovafosoralovu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a51e0cabc4---70572472548.pdfIn PDF document text
    • https://preciseenergygroup.com/media/zizumafajanezigalu.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///82258226313.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/rirakiradodifepavir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=watch+bohemian+rhapsody+putlockerPDF 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_off0000d01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 11216 bytes
SHA-256: 847315e14a92f1864c3380f48b2499713854ba2df5189a868ab5ba33ec737dc9
font_02_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 20324 bytes
SHA-256: 0410879cf43f2403d48f048936dff61b5a66ea9524a41feae7e0915ac298c3c5

Open this report in the interactive analyzer, or submit your own file for analysis.