Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f212a0116c985bc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 01:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31ae784afd10bbe80d11858bc2d6d7d5 SHA-1: 088c300728e89dd15272aba093442c77105706c0 SHA-256: 7f212a0116c985bcd403c4239dd081f182bef6e986452b6d8d4a34aeaebe4614
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious sites, likely as part of a spearphishing campaign.

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://irlanc.ru/uplcv?utm_term=dalvik+debug+monitor+server+is+integrated+in PDF link annotation
    • http://bronia.org/userfiles/file/15699717458.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210901183807792.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/perituganemu.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/pevebatusapixepawal.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/7geb9go83ha0isca8u074hudu8/7975348530.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133ac8580363---23432909007.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/83009484497.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/guwudatuta.pdfIn PDF document text
    • http://onlinevay.com/upload/files/87533076852.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/zonibumetebimivuwulamulik.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/kefejuwogotag.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/lagulasixegixebapiluv.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/86445380352.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/87153721402.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/wajizovupuvedigorefijam.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/81464291036.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/rudevuzib.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/78506694088.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/jaromamupugurodedulolujo.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/80090925919.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_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 10988 bytes
SHA-256: 8604b92eced60ae7604732c9e199f52e56acfdbd31a7ac6bfe68932c211bd7b8
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 16684 bytes
SHA-256: 6805c141f6fcac69cc222db43fb04165993cb0373906e4613cd6c670dfb599bc
font_02_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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