Malicious PDF — malware analysis report

Static analysis result for SHA-256 218b59b6de209166…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 20:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b85aea87da80fbc5016dd6d6a31deb3 SHA-1: fe5b385f297122ba1dc3dc4e23a9c1e9ca8ea2c3 SHA-256: 218b59b6de209166363f50789ebef51651324a051224b711ee167442c8edfed3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one prominent external URI that appears to be a redirector. The PDF structure and embedded links suggest an attempt to direct users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=teratogenicity+and+mutagenicity+pdf PDF link annotation
    • http://cosmoscm.com/contents/files/96386591121.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/938155678a4b0b0eaf7f5671d9e0d727/82074642205.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90307041745.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/84856042627.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/32007406494.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/kobigila.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/38936515450.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/26261872865.pdfIn PDF document text
    • http://humanlitech.com/files/files/xumaredoxat.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/xonomegidogapasegotekago.pdfIn PDF document text
    • http://ping-property.com/user_img/files/20061983064.pdfIn PDF document text
    • http://it-hair.com/userfiles/97489227840.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/73250429193.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/ketewojurumokutepakixu.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/38292532041.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/59989747372.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/rodoxovev.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/fufafulawe.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/58087257811.pdfIn PDF document text
    • http://retailcop.ca/files/vunawiseledefifedax.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/purelusotomoxifoxu.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/sisimizowobupojobu.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/85610257388.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/degogufezetapepov.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c825ad673---93707011965.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_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 10928 bytes
SHA-256: 1658214352e1bf177ee04b730117d27da43e946e7b46ab81a8bf9846681e3a23
font_01_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 19256 bytes
SHA-256: 983eff7412a227dcbb48e09afa51d089ecefe5519a054be20259d1f928523cb9
font_02_sfnt_off00012b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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