Malicious PDF — malware analysis report

Static analysis result for SHA-256 962a7abd88e32e27…

MALICIOUS

PDF

71.1 KB Created: 2021-09-11 23:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa06572771ee6edf0b8e82293118a2bf SHA-1: 45a3ff8a0ff9f380a4d85fed744e2c25bc059e09 SHA-256: 962a7abd88e32e27f20c227a7277f1d99b744048f14e70415b5830a0e4bb72b5
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. This suggests the primary purpose is to redirect users to potentially malicious content or facilitate SEO abuse. No scripts were extracted, limiting the analysis of direct execution vectors.

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 https://youkuvpn.com/upload/files/65542284700.pdf In PDF document text
    • https://autoskola-scp.com/files/niwobu.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/kutekuzutofefupogelope.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/53b40936a66bfcf0182f12ca64639a0d/23791823203.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/15385288358.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10b0d0920---repekobu.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/purarex.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/27206727868.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/2128639442.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091105021073499.pdfIn PDF document text
    • https://ekransamara.ru/files/29962032680.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/lebupujenojefafamasituke.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/58953367314.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/janevolalirilarilixekusar.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/2974142136.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/wodijusorigowesegosi.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/sepodopomaroser.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/59843355487.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109090849205444.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/80407349128.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/77451171297.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/losakujimalaf.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/66963219485.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/93616235558.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/51244779456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=can+i+use+omegle+on+my+phonePDF 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_off0000b868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB868 14812 bytes
SHA-256: 4fd54836f263fb55b4d18843f77e19c7c174d3a983c13bfa05019c5cdcdc53b5
font_01_sfnt_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 10748 bytes
SHA-256: 86614fb13c451672f6822390870edfec21c498c12063cd92694d5488b92ad4d7
font_02_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1