Malicious PDF — malware analysis report

Static analysis result for SHA-256 a486695349a2f5d0…

MALICIOUS

PDF

82.5 KB Created: 2021-03-28 11:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0282f0fc9e313b94ef00e5595234e480 SHA-1: 4062fe7c50e4323ba17f64d3070151bff917c349 SHA-256: a486695349a2f5d06f939d0a0249cb785e7e9dc39ff6adb651066c26ae8a8059
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL pointing to a 'spotify premium apk hack' lure. The PDF structure suggests it's designed to host a large number of links, potentially for SEO manipulation or to distribute various malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://kuzutuzo.ru/123?utm_term=spotify+premium+apk+hack+old+version PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470221/normal_5fe0a97ea6cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5fd8fbc8babef.pdfIn PDF document text
    • http://pet-guru.shop/29409138982jeody.pdfIn PDF document text
    • http://alkostore.xyz/hamilton_flexbrew_coffee_maker_reviews6j0ex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_60480d39370e4.pdfIn PDF document text
    • http://lajokuxix.22web.org/baixar_para_android_em_portugus.pdfIn PDF document text
    • http://snegny.com/31566409043pv18i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_6040631fa101b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485801/normal_600e42428c3af.pdfIn PDF document text
    • http://raftgjgr.space/3773409425grbiw.pdfIn PDF document text
    • http://samozanyat.info/jorimawepox6s7z9.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/5cd6d57b-e650-49a6-9a7e-391484b5717c/how_long_is_a_1_8_scale_rc_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b47ed70c-030a-4699-b521-1ae0e71c8b5b/midnight_sun_twilight_stephenie_meyer_movie.pdfIn PDF document text
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_6df0bf3f69dd4aebb19c15bdf189561b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/642b7c31-cb08-4b63-8cce-75dad87a1324/rinorotesupememufajeseku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95da23e-00cb-4762-bba2-28c6001cf3b7/how_to_pass_acs_organic_chemistry_exam.pdfIn PDF document text
    • http://kafupepizaji.epizy.com/cardiorespiratory_physiotherapy.pdfIn PDF document text
    • http://duguteterexu.epizy.com/kolkata_durga_puja_guide_2019.pdfIn PDF document text
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_c38b2a83b40a457888dec0182bf06869.pdf?index=trueIn PDF document text
    • http://gikisomu.epizy.com/ielts_academic_writing_samples_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aeff1f7-d343-4f8c-9c7a-588b51f31301/asmaul_husna_dan_artinya_download.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_68f01b2e8c4144eebe4cec8698f1ea64.pdf?index=trueIn PDF document text
    • http://pajilovusibu.epizy.com/forced_ranking_sheet.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_72d5d505fe124dacaa1af2b17b3a761a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc05272-f628-401d-8edb-5b6bbe8989f6/78636096033.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_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 5724 bytes
SHA-256: ddc56b0ca2b2cf203bd486c5bc2518d5bac61304a1a572895b020ba24bd125b9
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00011538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11538 11372 bytes
SHA-256: 97959d920618510b9a16b1233332344499907aa79b7d01802c994e5cfc3275a9