Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc415ffa5cac688…

MALICIOUS

PDF

97.2 KB Created: 2021-03-17 01:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1cedecfc3e0c9c857349301ad7a3733a SHA-1: a601d48d60e7f809af36a307cbd8176eb85b5301 SHA-256: 7fc415ffa5cac688a1f3ee80df2d304e75e6a3686066de62784a81d1b0d82a22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 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://nipisod.ru/123?utm_term=bts+v+winter+bear+piano+sheet+music PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419001/normal_5fe16cd532453.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/safety_data_sheets_should_include.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_600d82f288ef1.pdfIn PDF document text
    • https://cdn.sqhk.co/lekabewoz/QcnZhbv/anonymous_mask_face_mask_photo_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/jeihihq/skylanders_ring_of_heroes_tier_list_nat_5.pdfIn PDF document text
    • http://moxilekulina.getenjoyment.net/38597298115.pdfIn PDF document text
    • https://cdn.sqhk.co/mobixipotex/hLYqe86/78301076177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_602a34a29f007.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/s5iiaD6/nda_exam_paper_2018_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/chhM0jb/dudoferakunemizipifuzine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487382/normal_601b4481a7c4c.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/CX4hhhg/chest_sim_for_clash_royale_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/janurisu/MZQhiha/sovudixolepetuxufufalalor.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/rUicghd/mufezilubofixonenuse.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
    • http://kebenubes.onlinewebshop.net/mukuluzeturunupap.pdfIn PDF document text
    • http://wemaxoseni.myartsonline.com/zewobukuwerudopuvus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e872ce-9512-499e-a8c4-bceb9c5b153f/98077356012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6762de-a27c-427a-b66a-39886ebd40a3/vizio_model_e480i-b2_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c83d130-afd4-4737-be91-e1793046dd98/14699407540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0226d2b-b1a6-4949-9584-89d8925390ae/what_causes_blood_behind_eyes.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/microsoft_senior_program_manager_interview_questions.pdfIn PDF document text
    • http://rixigor.onlinewebshop.net/97766818431.pdfIn PDF document text
    • http://pulitisagot.atwebpages.com/alter_ego_1_workbook.pdfIn PDF document text
    • http://gekolutewubel.myartsonline.com/binusiwojova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c230f9-0d74-46ca-bc6c-f766ea30905c/2020_ieee_9th_international_power_electronics_and_motion_control_conference.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014ef0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14EF0 16620 bytes
SHA-256: 597725af4bb381e6f84ef6aadf52ad2a21be095d396cf7656d5b211364241b62
font_00_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 3908 bytes
SHA-256: 3815cd7159f4e173beab8015f3bb15dfea44a361552f7f29e87f1ce09425b334
font_01_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 5364 bytes
SHA-256: 5e66616cf7669b40b6778cba014964a5224c11cb04c90910b95024ae2b594403
font_02_sfnt_off00011a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A27 2432 bytes
SHA-256: b2d9e86a8c292c9a5e92f71207d43005a2725d629d30ab0a02a8988bf5d880db
font_03_sfnt_off000124fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FD 12148 bytes
SHA-256: 1e9f6deef3e4175c435cc41e57bfa67c1b983b87a86bb8182e49b4db845934cf
font_05_sfnt_off00016607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16607 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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