Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a84a22f7bc1cd2e…

MALICIOUS

PDF

80.6 KB Created: 2021-04-20 19:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 08fbd8173a057e574e134c7c5f26eed1 SHA-1: 11a660b508ab920a2f39299724951ec769d877ab SHA-256: 3a84a22f7bc1cd2e8dd641f8313ef0adbff525438308cf2ac98513cfd5fe2041
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • 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 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://mezovuduw.ru/strik?utm_term=cloud+security+salary PDF link annotation
    • http://feelslike35.com/808745933346po1b.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/jbOKxpz/jilokozowos.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/Qlahdji/7500989247.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/ciiOsih/gukokuzigo.pdfIn PDF document text
    • http://basiditdcf.space/kaputemibafofefuguzeddt88.pdfIn PDF document text
    • http://arevakar-travel.com/how_to_reset_a_casiovi1rw.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/jejhyyh/pay_as_u_drive_car_finance.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/aDKihSJ/watekaxi.pdfIn PDF document text
    • http://naturebiolog.fun/vizaruvopiwokafutesbuak8.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/mjaTFhi/lasership_number_of_locations.pdfIn PDF document text
    • http://bella24.xyz/dataflow_report_transfernie98.pdfIn PDF document text
    • http://geleostone.online/how_to_make_easy_pop_up_cards_for_anniversaryo8rlr.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/p0U5Hia/vebigamigiruge.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/hhT2iji/spotlight_theater_bistro_hartford_ct.pdfIn PDF document text
    • http://shlifovka-pol.website/tasco_48t_telescope_manualeh3ci.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzokikili/uhggcib/jump_rope_competition_videos.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vazisi/accretion_disk_formed.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/bakery_business_plan_examples.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_0ff2791831534228bd5243d43004b5ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/roware/interim_change_report_food_stamps_oregon.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/ozark_trail_6_person_tent_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/free_astrology_birth_chart_report_in_bengali.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_8f9e85cccd40470585412bd7c9f72fc0.pdf?index=trueIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_37df480c93bb4f42a07fa34b38ccc79f.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_off0000fd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5D 4940 bytes
SHA-256: 586a3b97fe72b8ddb972ec240c715e366dceb9f1cd93b10b5b5a87c1513ce3d1
font_01_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 11352 bytes
SHA-256: a929fbd717e997c4548ab33412957f31b50a02e8be140f1a6980672bebc1752c