Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b5fa1285efa7bb…

MALICIOUS

PDF

78.9 KB Created: 2021-06-10 13:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1901a6f89f5d0a2758f9b3d71e860635 SHA-1: 3e594c8a3d4f61e44305c13abbf208263cf941b9 SHA-256: b7b5fa1285efa7bb9cb4f57ea9eec88689f550c0535907e7ca7def31943edbf6
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URIs, with a primary focus on `https://jumiwimov.ru/123?utm_term=router+bit+guide+pdf`, suggesting a phishing or malware distribution lure. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` further supports this by identifying the PDF as a link farm on disposable hosting, commonly used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/123?utm_term=router+bit+guide+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445104/normal_5fe0ebde7ba0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380078/normal_600abff74e17c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_602ef208bb06b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393883/normal_5fc6b824ddaa5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481402/normal_5fcbc7e3cec2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wukexav.pbworks.com/w/file/fetch/144840072/lokizi.pdfIn PDF document text
    • http://doforegapuru.pbworks.com/f/warriors_of_future_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b968f11-24a7-4445-b1df-fef508239687/sony_fs700_video_camera.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/how_to_activate_g-shift_g502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e9ec71-1952-4628-821f-aa0e525505a5/14369517552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e28f200-1d54-462d-a850-2af93167971c/65690857101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d28cbfe-9abe-46f9-9bf7-1deec1cce980/31021981840.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144442083/to_kill_a_mockingbird_discussion_questions_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b4966f-b2ab-4808-90ca-be5c812697e1/how_to_clean_boneco_air_o_swiss_humidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d40e1968-53d8-4850-af66-c0b93f2ffa7c/2444002981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7564a75e-16c7-4b2f-b8a1-4bdd98a59a2a/las_mentiras_de_mis_maestros_libro_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc09b1ea-6e90-458b-aa42-8ac176f02458/ge_spacemaker_microwave_filter_cleaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ead86f-93db-4a46-bb04-b353ae7d6a65/40875114760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1e5681-e878-4981-bf40-d335729e0da7/73953753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1f2c01-6451-4a64-b27d-c6719dcc3c1e/what_is_a_liminal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc1c7b6-266a-4159-b198-282f294b3559/why_is_my_night_owl_dvr_making_noise.pdfIn PDF document text
    • http://wikitaxif.pbworks.com/w/file/fetch/144580074/what_is_the_most_effective_language_learning_method_for_you.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_off0000f6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 4936 bytes
SHA-256: 7cc1cb6a93f8315f48030e1f0f1a688488d82926389f99dbf1e5cb961ed47b0b
font_01_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 10740 bytes
SHA-256: b81cc8037f15efdf3e28b316bd8eb0090403febbf9a53fcdc4980d1a9f2246e9