Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb162dafa11f0bd…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 15:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8875bf05f7dab45c332354df2fe258c9 SHA-1: ea88ef55182d33a47255b59bc07cb5bc324e65fa SHA-256: 8eb162dafa11f0bd241b569835cecb806cc5bfe9aa8db1292bd17b45e699aba2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. No scripts were extracted, but the presence of multiple unknown URLs implies an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://abnigakgdsg.friendship-match.com/upload/files/98868830409.pdf In PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/sibekagadavifabazoriwudam.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/lugekuburoxoleruj.pdfIn PDF document text
    • https://digireg.sk/upload/48760499764.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/mefutojituj.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/54483931617.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/widobarizesegijaj.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/zokadaketaturidugudoku.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/18ef27b8731833956fa5cba087028e6d/butamaneziluni.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613007eb865cc---novafologonijafedale.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/tezinugipawi.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/89844505849.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/wafugup.pdfIn PDF document text
    • https://il-gusto.com/images/file/susaxujulubud.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/16232176108.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/fisafiv.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/vevovuxabeduzej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=avalon+high+book+read+online+freePDF 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_off0000cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 10644 bytes
SHA-256: ee204951759fec927ac780bde49606b3e427dcd226945f0049868398f5651c3c
font_01_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 17480 bytes
SHA-256: a95a465972c2d23599d34cc1071c92580fd6583c71459ecb12fdd0204bdd9cb4
font_02_sfnt_off00011502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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