Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2680c5182a62b2…

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 12:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8a7899ca534bc70dac543329db9c5edf SHA-1: 1df6a0fc818395cb00fd0f93cc111a5997489f30 SHA-256: 2c2680c5182a62b216e84e8d3df746fb89168f860e4d4608aff37f6f28ec1924
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm designed to redirect users to download files, as suggested by the 'utm_term=free download' parameter in one of the URLs. The document body is heavily obfuscated and does not provide clear textual content, but the overall structure and heuristic firings point to a malicious intent to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://poney-club-romilly-aigre28.fr/userfiles/file/43801483906.pdf In PDF document text
    • http://fruhmann-elektrotechnik.at/tuvibemim.pdfIn PDF document text
    • https://bursac.net/userfiles/file/sijalozebemiku.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/73022474337.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/vofiguraz.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/59908639010.pdfIn PDF document text
    • http://favourtec.com/attachment/file/94797699836.pdfIn PDF document text
    • http://cbstav.cz/file/98641297202.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/3017145697.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/zelupid.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cbn74hripb8gvfvu4jv6jiiaad/927145868.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/rekisazor.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/davopeboruzowom.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/lesiwarunitomixolavefoton.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/xalukivosa.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/dupedaxikijobezuke.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/37407439635.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/ruxitokademuz.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/51536426636.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/31663618493.pdfIn PDF document text
    • http://jcpingie.be/public/files/poxofalesivonotafij.pdfIn PDF document text
    • http://hangquangauto.com/files/29373001712.pdfIn PDF document text
    • https://keongracun.org/contents/files/kawanidonezejob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+download+pubg+lite+latest+versionPDF 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_off0000bed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED6 18804 bytes
SHA-256: 8272737d7fd08866a62a378f61e1acee484d01be3eb0b4ca74076289b5f2c8d3
font_01_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 10936 bytes
SHA-256: b5bb5b5f2f43029774de6fc382f9a02c22f5d70cba14dbd5db96b33a9d872dc6

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