Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb11db7e07f5c9d4…

MALICIOUS

PDF

84.3 KB Created: 2021-05-21 10:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ecda1609d04a18977b1b1e3aa7dd4695 SHA-1: 3d65d41c460d26a98500476b36fa3cf4876d2826 SHA-256: bb11db7e07f5c9d4c37bbbaa0e888bfbb316be994263633bc0895b7119b1bc61
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain ('kuzutuzo.ru') that is likely used for malicious redirects or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to disguise malicious content within a large collection of links.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=holden+astra+convertible+roof+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390664/normal_60462606da8b9.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/6190021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_603b8682f094e.pdfIn PDF document text
    • https://domomizidum.weebly.com/uploads/1/3/4/2/134235459/guzimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_6028f91412c03.pdfIn PDF document text
    • https://wupuvogobed.weebly.com/uploads/1/3/4/5/134507139/kiponuxixedidoroziv.pdfIn PDF document text
    • https://gotumofavi.weebly.com/uploads/1/3/4/6/134602885/lumuwopu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f15ab5-fe53-41cc-99e0-83767ef8a141/learn_english_through_tamil_app_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b02598-9867-463c-96e5-6feb80616fbe/cyber_security_salary_in_india_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30395d6e-f248-4e34-8403-45a8831a55a0/craftsman_6.75_lawn_mower_oil_leak.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/84456658391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac11f80-0640-41a9-a8e4-a91bb74963f0/zafajukusoxidexinobizoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60bde53-d3de-4dd3-8cb8-f457747833e3/what_is_the_best_carpet_cleaner_for_tough_stains.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc504f84-b7bf-4556-b5e2-a0c0615d03b5/pezopepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16366724-7384-44fe-aa30-3144578a0f10/tojosokabekijazurogolorox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58c0dac-15ca-4c33-86b9-9d02f4e202da/fender_super-champ_x2_15w_1x10_tube_guitar_combo_amp_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b57e9c-c56d-4366-9b5b-caca38bf7c52/chamberlain_clicker_garage_door_remote_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/android_toolbar_elevation_default.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c0a58a-dba9-46df-b824-bc4ffb2b81d5/portal_do_corretor_bradesco_seguros.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_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 5508 bytes
SHA-256: 67023f571e1e70845ea838111acb6e066fc934902714c2987f60c87df694b94e
font_01_sfnt_off00011e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 11012 bytes
SHA-256: 61fceba5df8a71851f1689c801def68a8b4b873c9eb56c06332bcb76cc57ea4c

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