Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f366849c4b97385…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 11:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7f647e1d199be3c0c3cddcc66ec9367 SHA-1: 68e9e1372bd0a3254520ecdc28b2c417ee9ca3a6 SHA-256: 0f366849c4b97385f3e815a1e1a9df56b9e3ea6d2304922858b8e7b9b6d1236f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are hosted on disposable or low-reputation domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=save+image+in+sharedpreferences+android PDF link annotation
    • http://sakem.org/userfiles/files/sigasumemebulixat.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/kuvenimewiruxivojibugiw.pdfIn PDF document text
    • http://actinq.nl/upload/file/regigozuwugiraxekudo.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210904_3E5D62DD9F4FF8D2.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/81691241542.pdfIn PDF document text
    • http://symbolfoods.com/files/file///bibogoragofaten.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/vilikoxinebagutata.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/26161990451.pdfIn PDF document text
    • http://learningkey.org/userfiles/47432583907.pdfIn PDF document text
    • http://quetthe.com/upload/files/7682579934.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee628d43ba---povoliluxexaropa.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/donalotawuv.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210914000118.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/2842646319.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/15929330746.pdfIn PDF document text
    • https://akemi.ro/hirek/file/8987598099.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109091159292574.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/28106609661.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/fesivo.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/78765691331.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/86682520413.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_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE215 21220 bytes
SHA-256: b66c69ca0048265a7f201c3ac9a92ef5dec88e4b4801965b9323aa2668ce2bf0
font_02_sfnt_off0001194b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194B 11064 bytes
SHA-256: 58ecf1a207082291f7f0558994392d767832bb1cfda8c79a4ff9f8dd63735a3b

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