Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ff4a76defafb2f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 09:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e060b1235023f161d58a97452e56586d SHA-1: 36876187518806de68a520f3db26bb5b29ac0dd8 SHA-256: 96ff4a76defafb2fcdec55605f21340d5a351ccbdc821d47cf91c17893f2490f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external URIs, suggesting a link farm or phishing campaign. The embedded JavaScript stream further supports malicious activity, likely for redirecting users to harmful sites or executing further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=shining+force+gba
    • https://ecosolar-energy.com/piceditor/file/wagosum.pdf
    • http://matrix-corporation.com/upfiles/editor/files/vawawepuwepuze.pdf
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/81121499352.pdf
    • http://xnucleus.com/members/member_images/files/51796086806.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380b0a65a37---lopoxobinazanomizuzuxaf.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/xovozenutemiku.pdf
    • https://pcparts.fr/ckfinder/userfiles/files/jerudeviti.pdf
    • http://beijingxinzhi.com/userfiles/file/20210901081705_117819765.pdf
    • https://dom4m.de/userfiles/files/91656366009.pdf
    • http://chokmanee.com/userfiles/file/44337441802.pdf
    • http://lnv-cnc.com/userfiles/file/87325531556.pdf
    • https://jechrina.gr/FCKeditor/userimages/file/43382524927.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/74750336971.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/zapivana.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367b22f34fa---pemukaxuwaxigogonajev.pdf
    • http://actinq.nl/upload/file/jonarowaxelobabukowavozor.pdf
    • https://celebicatering.com/upload/ckfinder/files/gajik.pdf
    • http://yotlist.com/uniformkontakt/userfiles/image/files/junubenotodumugudamifano.pdf
    • http://eiak.org/upload/editor/files/kogenepesifefad.pdf
    • https://giriconsultancy.com/content_files/files/kavusafoje.pdf
    • http://mgtofubbq.com/uploads/files/93282460774.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_off0000c1d0.bin
45bf2b79d16158362b10edac44204fe03aec89f5e41cb88ead59d7788300d310		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D0 10520 bytes
font_01_sfnt_off0000d9b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 16792 bytes
font_02_sfnt_off0000f1c9.bin
a0ff93f92eab7ccf67bc2617df1f18896420555c6d51a2e1f8e4331e701ace85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 17236 bytes

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