Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a3f79c517a405d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 00:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32a6ac808815bdf8e84b2a46b2023f85 SHA-1: b4f0cb9c653b43e90d1b5677ae50c49060fdc663 SHA-256: 18a3f79c517a405d4a7956bad604350b8f4a176a3c8677e18df913108b357b28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=messenger+update+2020+apk PDF link annotation
    • http://murasakijr.com/uploads/files/foxavuk.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/61712690155.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/5004585255.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/t13a12912joj61p1kj98njv212/lekilaxumemibive.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/12016568078.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/sosoxowitozozoxumaxizudim.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/xofiwuriwatowop.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/bedavagekuzutuv.pdfIn PDF document text
    • http://sdes.in/uploads/65534107538.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161469a16b0bd0---28765562259.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pezim.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/zukixazebugukukezasumov.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/reguzofefusot.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/79068580714.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/purotovutonotinalog.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/6003943914.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/41058650036.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/nulasuripinejubeka.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/51694057475.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///33281301082.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/60143120762.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_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 17060 bytes
SHA-256: c7acab898cd5a64f743517fba9e8412a96b9b168007bc71d43f5571a0dd9b521
font_01_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 10736 bytes
SHA-256: 13a4b87040e83334a64a1bd0902aee06ab0fe87809e6ee8c2e66ce6f7f0fef64
font_02_sfnt_off000125f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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