Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c6df7995a2dfb1…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 04:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c526a91d08b38cb681ab11fa45fc614d SHA-1: 86cc9115885b3ee7005ec8b92861e652e81d96fd SHA-256: e8c6df7995a2dfb1b457d81feecc876d336c21d130e25d8e98021cefc9a04508
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs pointing to disposable hosting, likely to redirect users to phishing or malware sites. The PDF structure and embedded links suggest an attempt to exploit user trust, possibly through social engineering lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://catamma.ru/uplcv?utm_term=mos+excel+2016+pdf PDF link annotation
    • http://vce34.ru/attachments/file/sevimugotip.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/vajetejuj.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/72470461253.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/12848770013.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16145a16da2de4---93634555755.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/josinelimetogulawi.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/78420878165.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/sawebelesumefakob.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/73819382207.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/zalofegumojinatagatag.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/84099620689.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/50988254410.pdfIn PDF document text
    • https://aademvegabaja.org/images/image/jevadekimisibuvefapis.pdfIn PDF document text
    • http://parfumland.sk/upl/60706137875.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/65441428889.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/39959085752.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec0b18a407---44524441357.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/romaz.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/18627765645.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/82046865501.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109081354328319.pdfIn PDF document text
    • https://goodline.by/userfiles/file/tozotexujasikalu.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/66296283444.pdfIn PDF document text
    • 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_off0000b124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB124 10616 bytes
SHA-256: d278315aec9b8192bbffa571e2c3813f6b687b4cf3f505dfb6682433da0b4f40
font_01_sfnt_off0000c9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A7 14288 bytes
SHA-256: 5801d81b0323c64b56539233c96e68f585c9465d17a7caa06a40ff8a778e799f
font_02_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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