Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cb64a4bf312c81…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 16:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5548eb406fa435980fb4d39d024207ff SHA-1: 54ac00fe53dde4fc8cb4c81e9b7736192a6c0f32 SHA-256: e4cb64a4bf312c81baf048823f0838a7b90071d80b35bf5e9c1384b821edb3a3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. ClamAV and ML classifiers also flagged it as malicious. The presence of external URIs and the link farm structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://henanshuangxin.com/d/files/narexefarolulikak.pdf In PDF document text
    • http://aranysolyomfeszke.hu/editor_up/18190478935.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/vewusozujodimaradunudoru.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/79696223382.pdfIn PDF document text
    • http://gdgom.com/upload/file/210906012059116972gco5lsdt3flx.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/vutinegakajubodubo.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/35906916353.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/ritadevumemutodexanupabok.pdfIn PDF document text
    • http://biosite.ru/images/news/file/53229057188.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/janidibamedijipunoji.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/6933300515.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/gewamo.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/10789146414.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/27804640078.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/joxorifibozuvasupafol.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/danelepisexopekuwidel.pdfIn PDF document text
    • http://calisnt.com/uploads/files/68835655441.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/13906125798.pdfIn PDF document text
    • http://shahgrp.com/uploads/73509448456.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161311dc046725---13000596668.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/5228640004.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/mefisesuxafisesajiwuj.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/f20d0ac1c349f4407d23405ae0f69bc4.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/pepadugif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+hd+ps2+emulatorPDF 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_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 16936 bytes
SHA-256: 68038d3d224e9ca66fde3c0eb789e00ea87f7cf65367237cab8cfcd71e38bce3
font_01_sfnt_off00010a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001225a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 10660 bytes
SHA-256: ec89aa9202af4d3f750e6909d44c52a5cd683c916495cde8f0255cb6abcceddd

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