Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e8214def6fb19b…

MALICIOUS

PDF

75.2 KB Created: 2021-10-04 05:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a1de7bd84161b9b2bab584686a64f7db SHA-1: 3c4801bef85d7e4ff65b4d0419556849396ff384 SHA-256: 08e8214def6fb19b07e86003bac430d4ac11ad4fe9c445f21336a59c9df77b41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm on disposable hosting, with numerous distinct hosts and UTM parameters, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://funagamex.vn/PhuongNamGroup/userfiles/files/7275726577.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6f19e6e72dfd143c8db7364de4d7f4e4/61176147728.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/bedag.pdfIn PDF document text
    • http://ahaadesign-com-tw.sales-frontier.com/ckfinder/userfiles/files/fagenakofivizakujeditofe.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/pejajalorividet.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/86495281027.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/38993757369.pdfIn PDF document text
    • http://pronobile.de/catalog/file/godirofetonarojirubirix.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109260851234756.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/bedirekaxabesuw.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/49613386052.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/gapilotazi.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/9225736199.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/zizamurob.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/80252317223.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/54569831950.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/nukelapopetufunub.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614710a9642f3---72862565044.pdfIn PDF document text
    • http://khocabien.com/uploads/files/nujuxitim.pdfIn PDF document text
    • http://mylodge-naoshima.com/ravemelipuxepojotorim.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///59089142077.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/87228369923.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/16584000585.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-20/20210920040346579142.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/vojawelujisupunukibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cheat+moba+mobile+legendPDF link annotation
    • 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_off0000bf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 18392 bytes
SHA-256: e4a83c0620928c2bc8e92171219963e35e20606092333665403cb9e048e435fe
font_02_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 10596 bytes
SHA-256: aa78c6502a8e69065d49200ca312e16a09c33a8409cf65b3f9d8f67fba64a310