Malicious PDF — malware analysis report

Static analysis result for SHA-256 8732ac095f09d5f0…

MALICIOUS

PDF

77.5 KB Created: 2021-03-22 16:11:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 35f51cf379c6ded16ea08f5f351adc86 SHA-1: 5361bda6ec9a2b52b2dd9296b16cce8a3726563b SHA-256: 8732ac095f09d5f0aa2d770990bdb59fd840176ab8f111072e68f40cac176bda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://golowaki.ru/strik?utm_term=which+of+the+following+is+not+a+function+of+the+lscb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463538/normal_602026312703e.pdfIn PDF document text
    • http://bosuxezaxad.mypressonline.com/speak_business_english_like_an_american_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/viwitukaz/bhgEphg/interpolation_and_extrapolation_worksheet_with_answers.pdfIn PDF document text
    • http://dovulup.iblogger.org/56262237687.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/g10igjh/nururomusimijama.pdfIn PDF document text
    • http://pakunobun.getenjoyment.net/atomic_absorption_spectroscopy_principle_and_instrumentation.pdfIn PDF document text
    • https://cdn.sqhk.co/talurelope/gfGghjr/d_day_beaches_tour_from_bayeux.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/44717339641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446390/normal_5ff8c1210fdc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467019/normal_5fee1df49ff06.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/cMZle4s/anime_stars_fighting_mugen_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5fee324d6c596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_6057f2cfb9ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373248/normal_601717ec40d7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_60131cf2f0327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_602c051547872.pdfIn PDF document text
    • http://ponemofetu.scienceontheweb.net/application_of_assignment_problem_in_operational_research.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_604cc238bc052.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://rerorexemebiliv.epizy.com/carole_king_jazzman_sheet_music.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/oral_b_white_pro_1000_reviews.pdfIn PDF document text
    • http://zasasopatadinu.epizy.com/clothing_inventory_sheet_sample.pdfIn PDF document text
    • http://nalosig.rf.gd/underwear_size_guide_uk.pdfIn PDF document text
    • http://xomedejufe.rf.gd/uwc_nsfas_application_form_2019.pdfIn PDF document text
    • http://xilagerezob.epizy.com/verbal_cues_examples_sheet.pdfIn PDF document text
    • http://rijevugez.epizy.com/68541907072.pdfIn PDF document text
    • http://peworesafasar.epizy.com/estomatitis_aftosa_nios.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_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 5176 bytes
SHA-256: fa49db4ceab191717fb22806c11e72e5b5cadc915dd537dd666ff762e23ef089
font_01_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 10300 bytes
SHA-256: 49675f58bb956cd40b398be8bb381427ed30083f9b7a30b49ef1ece762010cf8
font_02_sfnt_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3