Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76327e08759259f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 14:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84eae312e7c9ec704b89d73f5c8ab4db SHA-1: b6057603b2f37b545a42144402a5c9d44bc27172 SHA-256: a76327e08759259f65e43c6def5876d1884ae3ddbf5d25997bfd9b68f61ab66d
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, suggesting an attempt to direct users to malicious content. The PDF structure itself is also flagged for SEO link farming tactics.

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://tvsatkrosno.pl/userfiles/file/lupebalesulizamaruzokoxog.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3a261a14---tatamujapupoliruzara.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/82742129633.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/tojifotoxafunirevobo.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/fenitatuvaxakizerizula.pdfIn PDF document text
    • https://fong-cai.com/upload/files/47468019706.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/10167088525.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/10892092543.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/10354479282.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/55643565581.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613112742a4e8---90421801824.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/fokubikinegapipadidol.pdfIn PDF document text
    • http://adveotec.com/img/file/zexasasixavilijasetujir.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/tatidam.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/sodobivarefutunedok.pdfIn PDF document text
    • http://safarang.com/basefile/files/99143417980.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/47755728198.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/motukofomulukazosutuzoxup.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/25325054196.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/vuvixigam.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/wukuwukofusenaj.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/sokemimamowox.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/34753979429.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/49883350817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gun+war+apk+downloadPDF 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_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 19136 bytes
SHA-256: 0a150aec3e9b273df26d90a5571c750275596c31f6427193ff00e0f2609ccbb8
font_02_sfnt_off000132ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EE 10212 bytes
SHA-256: b68cf20e60879963761ca380027465c66bbbc7f694120b531da896a2f9fafed9