Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba5976e79a3cac4…

MALICIOUS

PDF

81.8 KB Created: 2021-06-10 03:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 16ed8152526fb7be8f37c7976e422459 SHA-1: 260fe3862cfabad3586a9c3fcf2502f576f2f633 SHA-256: 2ba5976e79a3cac499c372179a467a6617d232b2471107c97f7b54a75216fc24
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('nomylo.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/pbw?utm_term=oxford+dictionary+english+to+bangla+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416302/normal_600b0df6a4eec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446491/normal_603e4ed623720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_60678067e1240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498882/normal_6053e141dbac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_600ae6c2cd169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_604895f4d313b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479214/normal_60258bae806c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_605a9c911e46a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446917/normal_5ff293ac1e46a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_601d8c75274db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funuvutidip.pbworks.com/f/95404083434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ccb33c-dbbd-41ef-8924-0ffc90b3e950/tevuponopaneromawaroki.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/the_anti_estrogenic_diet_ori_hofmekler_warrior_diet.pdfIn PDF document text
    • http://ropotupi.pbworks.com/w/file/fetch/144740121/gasemuvirinasipoxige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e08d0f5-d3ee-4cae-b4db-85d014d83614/what_element_has_three_valence_electrons_and_two_energy_levels.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144933864/77660361475.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/66183914971.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144467952/unit_1_geometry_basics_homework_4_answer_key_gina_wilson.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/rejupadakifoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a577c7b5-a45c-441d-9416-d86a2e4ae675/sagazesurupokavuzax.pdfIn PDF document text
    • http://gosavepifij.pbworks.com/w/file/fetch/144694434/megekimibemaralafelulevo.pdfIn PDF document text
    • http://xiwesamoneni.pbworks.com/f/curious_incident_of_the_dog_in_the_nighttime.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/ieee_conference_presentation_ppt_template.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/rapport_de_stage_reception_dhotel.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 5752 bytes
SHA-256: 137b64d67fd5dbd11e86ebe5a01372dfbdf872eb7e75952092100b34d4e6d458
font_01_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 5712 bytes
SHA-256: 37736867fed107113db745feceb9c364c757199abd2c03cd7f75a3cea7486994
font_02_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 10904 bytes
SHA-256: b90ab6cbc332b92de6994c7d09780acece854295ed7dc1fb05f99ca38e6f5f8a