Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5b140d40dee1fe…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 19:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d49d983a4fa6486d490b72d52d601318 SHA-1: 5a1cb3d072919c7985bf47540c068751209029de SHA-256: 6e5b140d40dee1fe0b3e78c1dcd5c77e06dbad85e3c5e83e1a105bb1b6fc7f98
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external URIs, including one pointing to a raw IP address, suggesting it's part of a link farm designed to redirect users to potentially malicious content. The presence of embedded JavaScript, though not fully analyzed here, likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://yksskj.com/ckfinder/userfiles/files/80373022626.pdf In PDF document text
    • http://kfoodntea.com/dataroom/file/80363154250.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/92887266182.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614090ede7a35---vumizabodoxukidubavobuge.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/nusomefurelole.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/72742708394.pdfIn PDF document text
    • http://sb-78.ru/files/file/16512361174.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/7000287805.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/sikilonudidivepobexadix.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///kisudugasatifu.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090714483079624.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/katarebojizeroseti.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/46081629848.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/fitunebonaxesak.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210913085024.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/24376980495.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139272e08a93---radow.pdfPDF link annotation
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16139d0f9d8e50---gozasonofolokebun.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/87531259068.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/lobuxexudezu.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/30418585655.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/novivimovijap.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/xaguwabojujila.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/gatuf.pdfIn PDF document text
    • http://bienbao.net/uploads/files/rofewowaveb.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/vufumogitinupewufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=lego+creator+app+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_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 18056 bytes
SHA-256: 5020bfef999ea399e14506a77107f51bed07fa8de6d86179cf56dd6acc7c011d
font_01_sfnt_off00011a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001323f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323F 10432 bytes
SHA-256: defab184d1a8550ff3ab6a0b888ec64780955a7ad477cc3c22273a1d8bc1496c