Malicious PDF — malware analysis report

Static analysis result for SHA-256 599f9917e35407ab…

MALICIOUS

PDF

78.8 KB Created: 2021-05-13 04:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be89f583fd787d1a303f592030580a7c SHA-1: 2977f1596de1bfa90a26cd9f054107d918621346 SHA-256: 599f9917e35407ab0042b96b41e72edb463c6ce97aa6b8d8c24b07c43050b6db
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to various resources. One of the primary external URIs, 'https://vilenefex.ru/strik?utm_term=data+structures+and+program+design+in+c%252B%252B+answers', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=data+structures+and+program+design+in+c%252B%252B+answers
    • https://cdn.sqhk.co/rivotoxupow/cjjhjjS/nametakejowi.pdf
    • http://zarabatyivat.ru/why_is_my_dishwasher_not_startinggi4s0.pdf
    • https://cdn.sqhk.co/denepepunuja/hKjifkb/75031829959.pdf
    • http://espaceabone.com/equaes_literais_exercicios_8o_ano5fu5t.pdf
    • http://clientbluebadge.com/nunomuvawizelerj97ke.pdf
    • http://pressit.space/umpire_test_questions_answers8l9jo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/widiku/internship_report_example_architecture.pdf
    • https://s3.amazonaws.com/sorapobuk/ruwabisisemab.pdf
    • https://s3.amazonaws.com/desenaz/hay_mucha_informacin_en_ingls.pdf
    • https://uploads.strikinglycdn.com/files/016de49c-397d-4e34-b04b-5cd0b3b26bec/why_does_my_hard_wired_fire_alarm_keep_going_off.pdf
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_0a60684fb88c4de9ab7f1d5e0cfb3d61.pdf?index=true
    • https://s3.amazonaws.com/gitipelut/pdf_bukhari_sharif_in_urdu.pdf
    • https://uploads.strikinglycdn.com/files/a1e835ee-5659-4580-9864-f7850f14e5e0/tidufanunudaremafozulus.pdf
    • https://uploads.strikinglycdn.com/files/24d94e0b-db3b-4eda-92b0-f70b44d90615/sp_racing_f3_osd_setup.pdf
    • https://uploads.strikinglycdn.com/files/1f81aedc-227b-49d0-a758-71cc7e60d1dc/mr._coffee_caf_barista_bvmc-ecmp1000_espresso_machine.pdf
    • https://s3.amazonaws.com/nilafafakem/anything_goes_young_performers_edition_characters.pdf
    • https://s3.amazonaws.com/muwomapotumugi/inamax_ac1200_driver.pdf
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_becb9a1c4c784d56ac9621e795fa145d.pdf?index=true
    • https://s3.amazonaws.com/donarepemi/wanimupabitavobipuguvop.pdf
    • https://s3.amazonaws.com/lewuli/is_indian_food_high_calorie.pdf
    • https://s3.amazonaws.com/dupula/midnight_sun_book_synopsis.pdf
    • https://uploads.strikinglycdn.com/files/333648de-db95-4ac5-81ac-35f5e3ffb118/cisco_dpc3825_admin_password.pdf
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_bdb7f42cdd7e4ab7bdf106e27491c790.pdf?index=true
    • https://s3.amazonaws.com/wazotojemov/16733800495.pdf
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_8cfc7d3b69ca4d3a8f5033a7058064ff.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f325.bin
159c4e404814cb402f5e1820d50b2cda9e4992174ed5ff79ce051cc1507ba28a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 5452 bytes
font_01_sfnt_off000105b2.bin
0e69cc6b4acfefcc549cf11f9a1647e271765a3a826d745a36958e6500b2647b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 11952 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.