Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1822103d1607e0e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 13:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 341635eed10983e7752476ee096b0406 SHA-1: 9419e3b18b622c9ce0048439745ad604b8d4bf8d SHA-256: e1822103d1607e0eb12840645e19b130c4c57e4f6554c31b9cf9296668281a8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially malicious PDF files, and is identified as a link farm designed to direct users to external sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing and redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://classoft.ro/userfiles/file/wutolekelomuguviwiveso.pdf In PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/najipigifoxope.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/otoditoxa.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/vomewasifemajozupun.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/12372292487.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/57135953424.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/ditavif.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/vapole.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109060451197748.pdfIn PDF document text
    • https://0900107678.com/upload/file/refupovutetivimawug.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/64506918374.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133debdef7ee---90583156593.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/44901919564.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/gijaluxotewivawugusemere.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/34164590366.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/84064943421.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/96782919859.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/pukokosefevegilopajur.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/fabolofakarowuzarumibutu.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/91009642182.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/4575559894.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/kugodewulajorezited.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/lifekukon.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/68303576485.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/88743045368.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/99226929430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=free+football+streams+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_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 10632 bytes
SHA-256: a09ecf214a6bcbcffc15286e7e757ff2da840bd9efb23646aaea8e123ea2e9e5
font_01_sfnt_off000102b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 17072 bytes
SHA-256: 74b55339b2da3685521be49fbf88c38d9eef1e99339a118bab31c3c6b812a1d1
font_02_sfnt_off00012e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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