Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e289c0938d5b07…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 21:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7011409bb144b311487fcca1e77faf2 SHA-1: 6ef0cfdb4ca4b4cf359894f4b4404192b82885d3 SHA-256: c3e289c0938d5b074fda98599b692f708fcce2eee7e95e15e3e2c704ec954a61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, with one URL identified as a disposable hosting link. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content, suggesting its primary purpose is to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://fcraregistration.com/UploadedData/file/3852005389.pdf In PDF document text
    • http://maslatalaia.com/userfiles/file/17872077734.pdfIn PDF document text
    • http://levotst.com/uploads/files/42416199790.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/xolebibulologelezaxa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613979270a7cc---fudukeso.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/66971551530.pdfIn PDF document text
    • https://polaria.cz/images/file/88154288518.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/65093594408.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/899900653613c14a5ae0c5.pdfIn PDF document text
    • http://laduses.nl/image/file/71407932093.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/58994766744.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/gejuwezudevasev.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/nasafuluximasibam.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/29237924404.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/66576703782.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/51387138389.pdfIn PDF document text
    • http://vpsystem.com/files/fck/43836594549.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109111132106775.pdfIn PDF document text
    • https://brakos.it/file/mubexanobalu.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/vixanupukimamag.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/66020922115.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/68114299706.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/najuworuwem.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/23741986389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+change+wallpaper+in+androidPDF 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_off0000d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 17288 bytes
SHA-256: a93fe014f7634f18cffa0cf2fbdee44fbca444143caa3deb0d67f3725d1521ad
font_01_sfnt_off00010041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11858 10700 bytes
SHA-256: 5bd12d5dbbd9490e92820d5f51c5d8133f3fbc5cf8f871906a25e751cc4bd30f

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