Malicious PDF — malware analysis report

Static analysis result for SHA-256 5776e8a19a657648…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 15:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: becdb2097ad7fb832eeb4f38017ee8c4 SHA-1: 77a46b0f85a28e0ae87c9d334e28243e4b791381 SHA-256: 5776e8a19a657648d3871e62781ed1116a83865e847024d0f67fcc4884ed3929
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on various domains, many of which are flagged as link farms on disposable hosting. One high-severity heuristic specifically identified a PDF link to an algorithmically-generated URL, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://insightonafrica.in/userfiles/file/91824328219.pdf
    • http://moscowprice.com/content/xuploadimages/file/68909830135.pdf
    • http://carraracucinecomponibilitrapani.it/userfiles/files/jokuzowuzizobozipetomug.pdf
    • https://get-insurance.in/ckfinder/userfiles/files/tumozowubudevudivexawem.pdf
    • http://jshtextile.com/UserFiles/file///51448538517.pdf
    • http://unstitchedfootwear.net/files/file/dikokofujimotunaweguki.pdf
    • http://dydlhx.com/upfiles/file///885401739.pdf
    • https://nstoplana.rs/ckfinder/userfiles/files/revijenof.pdf
    • http://yoron.net/up/files/36257372071.pdf
    • https://mayphoviet.com/media/ftp/file/puwotodupiguvonu.pdf
    • https://moraure.net/js/ckfinder/userfiles/files/95764997148.pdf
    • https://samoinstitute.mn/uploads/assets/file/29673451817.pdf
    • http://simonkuehner.de/gfx/userfiles/files/xobaneregoxoxobejufobo.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb640d4ee---lugazufunifaval.pdf
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buganinirepiz.pdf
    • https://monyetjoget.com/contents/files/zodiwipogalozo.pdf
    • http://phubozena.pl/userfiles/file/88700778031.pdf
    • https://bengalroys.com/ckfinder/userfiles/files/dogafinajefixeda.pdf
    • http://8njl.com/userfiles/files/gogazixopaganutefiviwi.pdf
    • https://eguiders.com/uploads/10650655681.pdf
    • https://seedomoretravel.com/files/files/wupetuxaruraroduzafuvid.pdf
    • https://yumasri.com/assets/ckfinder/userfiles/files/97204194854.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/70776770138.pdf
    • https://rimsball.com/ckfinder/userfiles/files/99379333093.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=next+launcher+apk+full+version+free+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_off0000dcd7.bin
801d070379143b03e7e3de8548901d845d98ee6decfd2e3f20e19b4086159c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 11140 bytes
font_01_sfnt_off0000f6dc.bin
e15b1eb3697cebc6dc179c51e15547fbc8c3e54be8db2ed2fccff88e7ae25b31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 18416 bytes
font_02_sfnt_off00012624.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 16792 bytes

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