Malicious PDF — malware analysis report

Static analysis result for SHA-256 586894306070a057…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 16:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a27193a72018a4b7eb67fb7c15fe4baa SHA-1: 6580c98c7218f9e4b94543f88fd814400d4afa8b SHA-256: 586894306070a057fd673fe5d5b775d22cf74d28f7e3fefd68e703730acbcd45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the document's purpose is to distribute links. No scripts were extracted, but the extensive use of external URLs points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=best+wifi+multiplayer+games+for+android PDF link annotation
    • http://allgeology.ru/ckfinder/userfiles/files/gazozufe.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/66228664563.pdfIn PDF document text
    • https://bursac.net/userfiles/file/27821142476.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/87175045279.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5ppia2t90sucf648k70nemi6hf/4641360542.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/gajodowovukedobexedaniked.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/95084221920.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/51065145149.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/wupilizegefis.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/49558075794.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/tanujowesirutebiwax.pdfIn PDF document text
    • https://rosycaffe.com/file/43711250627.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/096a665a850aa1088326f0d07af86891/wifavirabufireginubewi.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/77433633087.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/retena.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/37081616454.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/zigaxaxojitagiwobudewi.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/zokututivikexu.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/miwilu.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/pudetuxa.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/tavulo.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/ronop.pdfIn PDF document text
    • 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_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 11196 bytes
SHA-256: 7e51823e2a65a30e0f36f0aaa21fc5bc095f28339f0d0ce48218b6074dad80b4
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 16664 bytes
SHA-256: e44f8dbbf024cb67dc3379c23993abcb7a336385512ab5b3ac76ab885054192b
font_02_sfnt_off00012eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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