Malicious PDF — malware analysis report

Static analysis result for SHA-256 2683c668ec4bf764…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 06:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc9f6d86a18e7af3f889aa4fcf3f3bcc SHA-1: 5b6ed50158693499713ced11698438d3d3b9d891 SHA-256: 2683c668ec4bf764f6b5f05ff7f80e203d5c3972bcfecc0f3dfdf8ec18707437
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or engage in phishing. The embedded JavaScript and the nature of the links point towards an attempt to exploit vulnerabilities or trick users into downloading malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://secondhandgraphics.com/usrfiles/file/mopufet.pdf In PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/lisuronuz.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/34619224077.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/wefobazi.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/47077275261.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/42551152354.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/niwener.pdfIn PDF document text
    • http://feminella.ro/upload/fck/joruxidel.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/powuxivalegotelava.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/semejumakevuvasukotutukos.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/79482132613.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/nodaditisiraxenogod.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/85557215702.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/9b754e3f60a67d192c8daf4e75bca282/mamifakotopudofar.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/28886143210.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/2798384664.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/julerivezadedewurirexi.pdfIn PDF document text
    • https://ocw.tw/uploads/files/vajisazodevojipelen.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/pukonuropuserogewud.pdfIn PDF document text
    • http://badgerhillfarm.uk/wezun.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/21238597094.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02c3e18f1---82607910855.pdfIn PDF document text
    • https://luminex.pl/upload/file/gewuluvobuzebotujumano.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210909065536.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/puripesema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ping+test+from+androidPDF 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_off0000e188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE188 17932 bytes
SHA-256: e01bb06f2c6df20ebf5b9ffd137a3b740c5f70d51777245d29c7e954fec9aaf9
font_01_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 10652 bytes
SHA-256: c799d8842ee7bac624ba484ba73663b2f1eed322bdc62b41152985703a8cbaeb
font_02_sfnt_off0001284f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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