Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3e8dc8e6b0d090…

MALICIOUS

PDF

77.5 KB Created: 2021-09-18 07:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3411b3cb87256696179a8db89567b337 SHA-1: bc99cbfabfeb481f0795a20862ed5ada388fdec5 SHA-256: ef3e8dc8e6b0d090091365219e39d80cd46674d763154ce1b2dad9fee66f5c73
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an embedded JavaScript stream (T1059.007) and numerous external URIs, many pointing to PDF files on unknown domains, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed for obfuscation or redirection, likely part of a spearphishing attachment campaign (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • 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 https://rabudiagnostic.com/userfiles/files/paxugexajam.pdf
    • https://xn--80aesyq.xn--p1ai/files/file/vupaxategax.pdf
    • http://mylodge-naoshima.com/images/blog/file/70096459841.pdf
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/zusikexakixivewave.pdf
    • http://stamforgtechnologies.com/uploads/donarevevaxirixosaruze.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac0ed2001e---4251009554.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ed411925---momagalizexubajotivutana.pdf
    • http://factory-01.com/js/upload/files/26526578095.pdf
    • https://mysilo.com/upload/ckfinder/files/jaxuvejopalokirug.pdf
    • http://asupuro.com/upload/save_image/files/minelat.pdf
    • http://autothudo.vn/upload/fck/file/xodizupakugufebuditu.pdf
    • http://joyearland.com/ckfinder/userfiles/files/valanimetewesawi.pdf
    • https://marbletreasures.com/uploads/image/files/31973549287.pdf
    • http://iccjsc.com/images/uploads/files/kivawutefilobo.pdf
    • http://jyotiacademicpress.org/uploads/file/mapatomil.pdf
    • https://undergroundtakeout.com/userfiles/file/81104831702.pdf
    • http://www.cerel.eu/images/wyswig_images/file/16823605248.pdf
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/43616031388.pdf
    • http://congseng.com/uploadfile/files/2714451340.pdf
    • https://cristalensi.com/public/File/kelevebifologivob.pdf
    • http://udmvdpo.ru/images/files/33584276983.pdf
    • https://poganyvolgyi.hu/userfiles/file/kaxedilujubegixinit.pdf
    • https://frigosztufi.ro/ckfinder/userfiles/files/nogagujekanir.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/sadisidukugobitupodabibep.pdf
    • https://timminsrenovations.ca/file/Uds6s53YvRqGpmAA.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/31647441135.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fidaa+video+songs+hd+1080p+download
    • 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_off0000c979.bin
cb7c888184bbb8024bc94810423189c9fceba79a2b53e04520c83871160ef27c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 17284 bytes
font_01_sfnt_off0000f68e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 16792 bytes
font_02_sfnt_off00010ea5.bin
2dadf5bed8c1413f9622ec0ce7ee9275c43bbd2c052069b395b32b16662da0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 10984 bytes

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