Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb587a4151d18545…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 15:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 655e60c6689e94fef640eb3aa2dd88e1 SHA-1: 949733ca246249e419f487c4930420820d6aecf1 SHA-256: fb587a4151d18545211fdd8b91abc22be087410d959ecfe662a821634927f5b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://get.belonnanotservice.ga/away?/wp-content/plugins/formcraft/file-upload/server/content/files/16153fd7fbe38f---26609674673.pdf In PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/pesigezeb.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/49718908046.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/60213538015.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/wisopopaf.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/38482835383.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219443534886.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/70485320126.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/dikutapiselopalo.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/zodeni.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/kozasizediwupapu.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/74292887105.pdfIn PDF document text
    • http://loppisidjupdalen.se/images/uploaded/file/weberadegozabebofawoxaxev.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/xiwiguzum.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/pisivemir.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210902233538.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210912132206666994hahkl.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161514ff706411---lonalenizizekugejosepuz.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210905190731.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/41842475302.pdfIn PDF document text
    • http://vaynhe.com/upload/files/mugukosubebodikexigolawa.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/79748425849.pdfIn PDF document text
    • http://metallpress.info/files/1989859280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=32+prime+or+compositePDF 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_off0000b1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 10416 bytes
SHA-256: 7c26dea62fbea5394c09293d2ba7988c3e1aa858fc00a0a105a75bfd14c517aa
font_02_sfnt_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 16184 bytes
SHA-256: 2c57940f2edc980160c3ccd8773c83166bae8f224b5eb8a9adffbfd300852bf0

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