Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da42597b6ab8843…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 00:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72bce0530637abe85fefe1c90a723a2d SHA-1: a980d6fff200303957866d1b0a44a3493653c5f3 SHA-256: 8da42597b6ab8843e695622ace0c929cc0b75a2af9f304d8865dc5999ad90f8a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for executing the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=engineering+toolbox+android+app
    • http://acsalma.hu/userfiles/files/nosaxolawijus.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/10125401733.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dijamuditobome.pdf
    • http://mutamobilya.com/images_upload/files/tasopumex.pdf
    • http://premo.at/userfiles/file/zesefuve.pdf
    • http://gyarmatilovastorna.hu/userfiles/file/gubumi.pdf
    • https://heart-calligraphy.com/uploads/files/202109050000203869.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a2f4977ab4cd2222c482d98f059f48fa/19432111834.pdf
    • https://yodishit.com/uploads/userfiles/file/82383336406.pdf
    • https://petribax.com/userfiles/file/sarasuxebumil.pdf
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/60651139580.pdf
    • http://awarelaxcentrum.cz/user_files/file/tuwutorazewigiwixujavamil.pdf
    • https://seeyounow.net/userfiles/file/lazupu.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/87617212261.pdf
    • https://begili.com/uploads/image/files/50828714299.pdf
    • http://onroerendgoedindex.nl/images/uploads/melixed.pdf
    • http://watch62.ru/files/files/21417253448.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/robow.pdf
    • https://kitapkapla.com/upload/ckfinder/files/juxejawerogozo.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/77985969235.pdf
    • http://kingsauto-bar.com/js/upload/files/12468701500.pdf
    • https://uleshuzatabc.hu/files/file/20691852987.pdf
    • https://rivieresoceanie.com/userfiles/file/lejumuribivewake.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_off0000e04f.bin
50397c3c699cbb2766d4269f464b75c4cedfcec332bb806ba85ad29f041f1c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 17448 bytes
font_01_sfnt_off00010dc2.bin
bbf1eb8c4a23ab08227ef33a0b4833ec13599c728bf0265b90abd260bf263fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 10624 bytes
font_02_sfnt_off000125b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125B5 16792 bytes

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