Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b521358006ddd97…

MALICIOUS

PDF

86.8 KB Created: 2021-09-11 00:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a9ae735d6b2c5bae5e4b8123af10b07 SHA-1: ba5fc68b7e4b851013b631957d90e6e758cbd837 SHA-256: 7b521358006ddd97f8c8f195ab039295b1881df2b4ab2cd089260a6e6c9305d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, with some domains identified as disposable. This suggests a phishing or malware distribution attempt where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://n3ss.ro/ckfinder/userfiles/files/45005870974.pdf In PDF document text
    • https://careersourcechipola.com/files/public/jidevetesazikivimeligo.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/bemulaxudupadifunuwifo.pdfIn PDF document text
    • http://protezas.lt/i/File/56019782313.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/16555145627.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210902055056549.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/vinajevewupamaxafuxebuma.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc8e9e5a4f---80684692921.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/melajeranexudugerim.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/lubelizigasezukebedigu.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/fepivero.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/savarivesazuvuradik.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/noxigezetikomixudep.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/44049317234.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/kimewudubopuwepivuwuli.pdfIn PDF document text
    • http://showdoimovel.com/files/files/gajapitemed.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/71828723279.pdfIn PDF document text
    • http://hijoin.hu/editor_up/rekalixiseridozepaj.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/pogatenonuxibimazere.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/zirurufutefajul.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133e685e901d---67550733057.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/juxuwusovepiseziledu.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/jefasisemitof.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/63050533414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gba+roms+pokemon+fire+redPDF 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_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 17200 bytes
SHA-256: 5756fe9d59e0473ea016efe3909d81eb5d0e5a873fffdb82b9049b22977b8f03
font_01_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13586 10788 bytes
SHA-256: bda89fe760d0fc9085841a25662375a6911e35a30c84ca57139e5422b0e5f66c