Malicious PDF — malware analysis report

Static analysis result for SHA-256 b038a8a999f91a9b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 17:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3654f33bcda1201a5dca5d39f518c035 SHA-1: d2e4bcffc09e6c65deda818b9e427cd7a3cffb33 SHA-256: b038a8a999f91a9b28a2e15f2d6c254b563f72ada69e9f35ea22b9f7b747846f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains numerous embedded URLs, many pointing to suspicious domains, and a heuristic firing indicates it's a link farm on disposable hosting. The PDF structure and embedded content suggest an attempt to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ebrinteractive.com/userfiles/file/22088781552.pdf In PDF document text
    • https://sunarchegypt.com/userfiles/file/80423218311.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/pozanenigiziserevovuzi.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/74224774086.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zexuwozu.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gozipesavojomarawirezusol.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/69465595817.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/40956332729.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/nowolepabozelep.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/1342830759.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/39433926563.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/renatogodixexoreremuwusel.pdfIn PDF document text
    • http://emeat.ru/var/files/69489103428.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/57050762052.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/ragefemivipifinoteneni.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/kikanagi.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/dibekurujosexepogu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8084c222---45447473890.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64414247657.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/20635451755.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/71939864442.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8b128a6d---govosekumejewow.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/zinesemujow.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/60862111589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bajar+ares+para+android+gratisPDF 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_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 10704 bytes
SHA-256: 6a1e9fb9b9f5118cba436a55bd70e6ed776b91b76682b4d4c17faa2677af3262
font_01_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 18352 bytes
SHA-256: b74be4cbbe4ae496e13fe2952d82a1574c30a31af80abaa95119732658c1457f
font_02_sfnt_off00012108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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