Malicious PDF — malware analysis report

Static analysis result for SHA-256 9710d5229963eb15…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 06:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f41cfccd07e893eef035349ecdfa1339 SHA-1: d842e5688b1996684cf9e172e42ac26f13900c28 SHA-256: 9710d5229963eb15aafc0d46f63c98ce45605db32cd1267a5d98911a3d8f6af4
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 variant. It contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=vidmate+apk+update+new+version PDF link annotation
    • https://altstudio.be/app/webroot/uploads/file/nosadujajeluwezofu.pdfIn PDF document text
    • http://partnercable.com/files/neverodizinipug.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/buleguzajob.pdfIn PDF document text
    • http://thevalleytrader.com/files/70428421596.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c67e73c0f4a6e20e7188b8d08abe1fcb/laseforexotofi.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/josuritututu.pdfIn PDF document text
    • http://thevalleytrader.com/files/dinelupumofogesa.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/71728040316.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/wofezodadekafezekajubepud.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/wunusasa.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/degamor.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/9264062425.pdfIn PDF document text
    • http://tabletopad.com/images/file/guzenisofumamorulajuv.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/11349575290.pdfIn PDF document text
    • https://phukienbep.net/media/files/fiwopavuwev.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/wujifavogaronoxu.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/lofemaziwujebepuwin.pdfIn PDF document text
    • http://etnorom.hu/pictures/fuserebetebu.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/koguwolaxek.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161342136ecd58---sogogebojevolipezidaji.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/12584014879.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/robumekona.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/11319814915.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_off0000afe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F2 15540 bytes
SHA-256: 90ae8e697031f0511bad7438acb059ac27b4ac9f0e5cb3ae067e7d012fcb241e
font_02_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 10820 bytes
SHA-256: fc5bb1f3af270c342397be91bbd2ac706c0b7b780bb59dd62987ba9105708b7b

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