Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76f9819bde2483d…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 14:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7d7683ecb932c4e487a8d7d0720a0456 SHA-1: 71c0ed2448f2aafefb5cb70804ef702fc39ab491 SHA-256: b76f9819bde2483df180c7bf8e9a84f4dd21b609692141c750ebfee40029d55a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing infrastructure. The presence of external URIs and the overall structure indicate an attempt to redirect the user to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=where+can+i+watch+how+to+train+your+dragon+2 PDF link annotation
    • http://intemhathanh.com/img_duhoc/files/96309585706.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/57268006856.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/65254226510.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/54800050163.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85885709308.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/suvajagowopeguwisepo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/j79e5gm1945pponj8tos782tc4/tikikizevij.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/53663591229.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210905230937.pdfIn PDF document text
    • http://runo34.ru/attachments/file/66159546760.pdfIn PDF document text
    • http://konberdbio.com/upload/files/86237521303.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/lofosirunixabajalisabop.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/88394127769.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/31145401424.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/nugukuf.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109050105206111.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6a97dc3e1---pakekagafusivikebo.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/pagewekepiwedegekevegebi.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/wufemitarexugidudijikipe.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/34507353443.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/tifijewum.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/60085501714.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/tawisedexi.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/9755631776.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/52912993824.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_off0000c272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC272 17876 bytes
SHA-256: 88473de743a07d6b51885e09496b29cf9402a33f1c22b336c17f9fe60c9e7a5d
font_01_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 10848 bytes
SHA-256: 1a44c303bea7c5f1ccde15a38553916a3662bc55780f7ac044f29f7526b6b8ee

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