Malicious PDF — malware analysis report

Static analysis result for SHA-256 812213c5e2290816…

MALICIOUS

PDF

74.9 KB Created: 2021-05-07 09:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3b9f717979ced089801c8f575e91f604 SHA-1: a468dc9e177707370d8f6d11c70215df9423003d SHA-256: 812213c5e2290816fc5376863fe172a4257c8c265a628d9ea2b9ab21176d473a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, with one prominent URL pointing to 'maypoin.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, which might be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=simple+pencil+drawing+images+of+nature PDF link annotation
    • http://bopugafuwu.scienceontheweb.net/97454664047.pdfIn PDF document text
    • http://rimarilomikozu.medianewsonline.com/all_quiet_on_the_western_front_test.pdfIn PDF document text
    • http://wudenufodoroziv.scienceontheweb.net/29626633376.pdfIn PDF document text
    • http://zukerazewumalu.iblogger.org/goxenuburudopize.pdfIn PDF document text
    • https://ronudinogem.weebly.com/uploads/1/3/1/3/131398573/8366678a1f.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/18268125605.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/adding_decimals_worksheet_5th_grade.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/1051241953.pdfIn PDF document text
    • https://valabokewem.weebly.com/uploads/1/3/5/3/135311070/vumezarunevogiv_pafovibiwa_nuterojonozesus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d6da986-5be3-4955-9d5c-e891e6c56a45.filesusr.com/ugd/3c671a_a93d8d501dae4fef9dee3b633f8dc1e5.pdf?index=trueIn PDF document text
    • https://404c0e03-56c4-4888-bb84-d9d32a71a3e4.filesusr.com/ugd/100e2e_927508f46e4d45849c9e781b5cc90a41.pdf?index=trueIn PDF document text
    • http://dinoretanoj.rf.gd/34174096140.pdfIn PDF document text
    • http://gezojetisab.epizy.com/adriano_gianturco.pdfIn PDF document text
    • http://pewubik.atwebpages.com/nikok.pdfIn PDF document text
    • http://kokefuvikedile.rf.gd/satipez.pdfIn PDF document text
    • http://saluwagasa.onlinewebshop.net/rp_jain_digital_electronics_download.pdfIn PDF document text
    • http://nutajowaga.rf.gd/aha_guidelines_acls.pdfIn PDF document text
    • http://zimemotom.rf.gd/freud_the_ego_and_the_id_on_metapsychology.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 5668 bytes
SHA-256: 7901a9ae9a206718ebb8aef21d57ae76783bf96abd747bf9959559626db3a457
font_01_sfnt_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 9624 bytes
SHA-256: 6facd4cd65357e2032f2f801b1712ea9d842a3edd241ba02df88df3ca06ea061

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