Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e0ddebb204a68d…

MALICIOUS

PDF

68.0 KB Created: 2021-09-14 16:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10c31777025bafe603ab754a402a620b SHA-1: f3fbbf22b368752d6f4f8a89c463d818df83d56c SHA-256: 31e0ddebb204a68dd80f74ceb9cdb9e3c2a1be4667ac2b2212e70f9d7215e1c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://smidgel.ru/uplcv?utm_term=iphone+11+vs+samsung+galaxy+a71', suggests a lure related to mobile device comparisons, a common tactic in phishing campaigns. No scripts were extracted, but the structure and URL distribution strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=iphone+11+vs+samsung+galaxy+a71 PDF link annotation
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/vomesugevogefemikozomel.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613836b10f9e9---wigidinipikosadoxage.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/figexonumebikerezilodube.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/gujus.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/sorobapejesusovap.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/43969228052.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/11640240703.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210902191648_gaufv4.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/jikufakefinez.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/78hnug3pbqd31m04caacr7ao0t/40045590084.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/sujudasubizekejor.pdfIn PDF document text
    • https://eklyps.net/images/file/32199687792.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/dagarega.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/pelajel.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/sutofotadebizuzurejujob.pdfIn PDF document text
    • https://partnermind.cz/images/files/87557095956.pdfIn PDF document text
    • http://abwva.com/uploads/files/70494139595.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/7893666282.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/mosejujusivukalas.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/54830297138.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_off0000ab95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB95 10844 bytes
SHA-256: ab026708ed2442cd1cfd645876fb5374677e5d64175e1324d93e1b8fdc744b32
font_01_sfnt_off0000c496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC496 15340 bytes
SHA-256: d8da4d3b8033e37f25239782f04c891d7797bf9c396cdcf2ec312f12613a1070
font_02_sfnt_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1