Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f355612230c6bf…

MALICIOUS

PDF

77.7 KB Created: 2021-06-10 11:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b1e1083790a2b6efa3fc78e30b652e2f SHA-1: 751c00067899f31603c699306be52ca1db88bf1e SHA-256: 02f355612230c6bf064c4c570543e0775856a37b350ff5fcabfb5d1fb13a988b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing or trojan variant. The embedded links, such as 'https://cructi.ru/pbw?utm_term=bad+romance+notes+for+piano', suggest a potential lure or redirection mechanism to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://cructi.ru/pbw?utm_term=bad+romance+notes+for+piano PDF link annotation
    • https://miragitoketulo.weebly.com/uploads/1/3/3/9/133997248/desefixedanixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_605a28d9303b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_602cda301cf6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418781/normal_60032b83b8c44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387412/normal_5fca8765ae65f.pdfIn PDF document text
    • https://kamenibez.weebly.com/uploads/1/3/4/7/134727972/gufixogefulipetumu.pdfIn PDF document text
    • https://foziletixe.weebly.com/uploads/1/3/4/8/134868526/8652530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490529/normal_60438737eee36.pdfIn PDF document text
    • https://gamupizesusaza.weebly.com/uploads/1/3/1/3/131398140/28a5023da3d155.pdfIn PDF document text
    • https://nobezenarevux.weebly.com/uploads/1/3/4/6/134628045/a56081999e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380068/normal_5ff27738c4e25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5fc8303778661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457006/normal_6037ec77561f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3cfa7fe9-0108-4612-8f50-b0afd9fc76c1/gabotusopunarelazipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32a5f38-4dfb-4fac-b466-14e1d4a55847/tinafunadumufol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3db2853e-e965-4bdf-bee1-f30c14237c04/fender_mustang_3_v1_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6dfa60-8edf-4da5-8050-d95cc40d8a47/25269001001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e682e8-e190-4466-aac4-0fa8ae2316a0/zisogaleb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed8df83-02bf-4ca5-b508-45c65a8ace92/8798573839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a79382-7788-4686-9b8d-142f75ddd7dd/22518608532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d836ff-c974-4fad-9b2e-6216751d952c/8083553484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46adf2e0-0306-47d4-ba68-7f2b4b8103e8/rorebexugolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894a3392-1853-4b20-90c7-485b53a8bb10/war_of_the_worlds_2020_season_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efec1db7-81a3-45e7-944c-7e8b5f3cec08/bebosetafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aafe11b-36ce-4bf8-8dcd-48715b774cbc/world_map_images_with_country_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76578a7-6e53-465c-9cdc-f7e3bdca7676/guia_ceneval_bachillerato_2020_gratis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 5108 bytes
SHA-256: 31f1823899db53384dd3b79e2a9110a2fa8ef7970c6ba948f976650040402584
font_01_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 11640 bytes
SHA-256: 6f6afed0bd11e22c451696e3bc36ef148d224249580918caa9d7ab00b5db1514
font_02_sfnt_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176