Malicious PDF — malware analysis report

Static analysis result for SHA-256 099f45baa7eeaff4…

MALICIOUS

PDF

79.7 KB Created: 2021-05-13 21:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3d935cd20d2c130c2efadae00b9c9568 SHA-1: e35bfed78ad1a7413148b8e932acc23c2954af74 SHA-256: 099f45baa7eeaff417f4e250566aad5af689c59f7dbfb9f48c9df4d321bf0bce
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 0.9967

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://bologen.ru/strik?utm_term=is+cyberpunk+2077+free+roam PDF link annotation
    • http://bigno.space/69076820670ye5mg.pdfIn PDF document text
    • http://zusozujowumid.iblogger.org/what_is_simplex_in_computer.pdfIn PDF document text
    • http://molotkov.site/canto_ya_no_eres_pan_y_vino_letra_y_acordesvahs0.pdfIn PDF document text
    • http://bozesedixek.mywebcommunity.org/can_bus_troubleshooting.pdfIn PDF document text
    • http://fapseo.ru/how_to_improve_time_management_at_workqqf37.pdfIn PDF document text
    • http://spindlndou.space/is_construction_hard_to_learnb3d8e.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/mupalexuzojixulafaju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_b79c11bc2055424b990cac70b3343898.pdf?index=trueIn PDF document text
    • http://bifovigavij.myartsonline.com/barron_s_new_sat_practice_test.pdfIn PDF document text
    • http://suxotison.epizy.com/clawhammer_banjo.pdfIn PDF document text
    • http://fikamax.epizy.com/the_art_of_argumentation_and_debate_by_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/christian_songs_free_._com.pdfIn PDF document text
    • http://fatavetotujel.onlinewebshop.net/qasida_burda_shareef_english_translation.pdfIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_fc34c008a9964e9f85de1a2e62711c1e.pdf?index=trueIn PDF document text
    • http://dosekidonara.epizy.com/basic_clinical_pharmacology.pdfIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_8b0200f784364920aaeb00ea1989c7f7.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_ef78eae8f3344d029d1e923f6cd501bf.pdf?index=trueIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_9cf9fe4829684ec0abd7784cae90aa6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivala/70870622973.pdfIn PDF document text
    • https://311919ef-92bb-434b-a93e-382c1a5e2e65.filesusr.com/ugd/c893b4_b7f53230c2c44ab38f0db1880bf4adcd.pdf?index=trueIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/honda_eu2000_generator_specifications.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/poker_cheat_sheet_excel.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_3547394935bf4f1b8ad882e3bd2162f9.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_4fbc9f5234774c28a7e9ab60e60a331d.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_f09c030e31a740678897eb5fdaaf5745.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_b9ff438fee7e49f2827355c7f8b4151f.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_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 5724 bytes
SHA-256: 7721669317c86ab1752134456f7a9c97404ec17c61bbea042fa32123002828e7
font_01_sfnt_off00010d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 10388 bytes
SHA-256: 33aa331a9d9081a3a3926401f61af464b3cf0c697874cba206115e7474217429