Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee133dab3ece4147…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 18:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f62759e43cf5b0aa5948af5a13f2989 SHA-1: 9eb6aaac25f75943e85e97c3b81f8b994ebbc55c SHA-256: ee133dab3ece4147634eb35d5823a6db77a72dea112541e695a4ad65a48290e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the presence of multiple unknown URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://investir-petroleo.pt/ckfinder/userfiles/files/39016523266.pdf In PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/52538463960.pdfIn PDF document text
    • http://farmina.ru/uploads/files/26276294218.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/tejexopapikuwoj.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/87221228003.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/zigugigajereputonate.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/37222707836.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/gekuzeger.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/15bdl0qq8maddprpot338ll4nd/numakuboselazakokimutu.pdfIn PDF document text
    • http://th-hl.com///upload/files/bobifekarar.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/xudajebufijilixina.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/79047673883.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/matuwuwifidevigamibojim.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/mafipap.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/49866718107.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/wobavafimebijenarujukuw.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/43406745587.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///10486451435.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/41426236420.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/34849036096.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/mexesagagifenamimomavuv.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/fugomo.pdfIn PDF document text
    • https://eurotig.ro/file/gebupituravuketux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mod+funky+bayPDF 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_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 10152 bytes
SHA-256: 35a893f94cdc2411f488cd0aa96cb6804d2400ac6a78e1bced52b572f1d416f4
font_01_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 18184 bytes
SHA-256: 4542646b13b82cc2a0433ef202f5bb5ebb35cd8d07d68c776becf9c635527fa1
font_02_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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