Malicious PDF — malware analysis report

Static analysis result for SHA-256 55108bb49e52511e…

MALICIOUS

PDF

87.5 KB Created: 2021-04-09 15:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 79ffea65d6de44d0a02f2f9c998eb2fd SHA-1: 25def44f3cbc9e890a7d2eb82e7de6fa0f11b1aa SHA-256: 55108bb49e52511eee010ee1e6e779a59647639811f9ef3e3ffeede4d2582c28
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to pairing Bluetooth headphones, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+pair+sony+bluetooth+headphones+wh-ch700n In PDF document text
    • http://uniques.space/does_a_cold_air_intake_increase_performance0fb1k.pdfIn PDF document text
    • http://futup.ru/xuvamulagolafakerazpfhvt.pdfIn PDF document text
    • http://pet-guru.shop/10.snf_kimya_palmemrnjf.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/golds_gym_stride_trainer_350i_elliptical_instruction_manual.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/canon_eos_t5i_lenses.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/WGXQjfi/voteta.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/what_is_the_range_of_uv_visible_spectroscopydkt2f.pdfIn PDF document text
    • http://neo-tp.ru/saeco_coffee_machine_problemsr5d59.pdfIn PDF document text
    • http://grizhoff.ru/tutagaiglir.pdfIn PDF document text
    • http://ighelperscenter.com/histoplasmosis_idsa_guidelinestla5l.pdfIn PDF document text
    • http://pixxel.life/6183998660su7ed.pdfIn PDF document text
    • https://cdn.sqhk.co/dodanadofu/Ussgiic/roblox_promo_codes_list_for_robux.pdfIn PDF document text
    • http://remastacer.com/79934985228xhzq3.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/astm_a36_mechanical_properties.pdfIn PDF document text
    • http://umdtheatre.ru/find_area_and_perimeter_of_rectangle_worksheet48oy8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_4ffec0a214c8417b954d2e546accdd2a.pdf?index=trueIn PDF document text
    • http://bavatesivo.myartsonline.com/free_download_english_grammar_book_for_kids.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_f0fda4b00f484b6482d0d6735e18cb9d.pdf?index=trueIn PDF document text
    • http://bugazepoja.onlinewebshop.net/cg_police_merit_list_2020_download.pdfIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_e71587274c434d6b8be458ef97b846d7.pdf?index=trueIn 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_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 5712 bytes
SHA-256: 06f9866a6e60e122c58bcca29193deda26b5f977142f6edaa62a0ad8bf3f190f
font_01_sfnt_off00012aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEA 11032 bytes
SHA-256: 8347d16dcb7eeec6e870cd774d07af5e9b6b31f4031b8519f22b9df8c6ac67b9

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