Malicious PDF — malware analysis report

Static analysis result for SHA-256 309a7a139119c006…

MALICIOUS

PDF

83.2 KB Created: 2021-03-24 18:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 52def90caae5195c2e56adf9a87806a6 SHA-1: f656d80426d69c30ed917915e6305e2613f59ab4 SHA-256: 309a7a139119c0064c80a98ab82221cedddb31153e38bcf4ea6a4deb8cb171bf
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. One such URL is https://vilenefex.ru/aws?utm_term=bissell+little+green+machine+walmart, which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://vilenefex.ru/aws?utm_term=bissell+little+green+machine+walmart PDF link annotation
    • http://1gusevshop.space/analysis_of_blood_report_onlinegjpnr.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/ifUDTgh/sabevekarusogepok.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/5xhi9gc/99648111377.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/ghwgilJ/disney_account_login_issues.pdfIn PDF document text
    • http://jumufedug.22web.org/52795973752.pdfIn PDF document text
    • http://rukunikuxajosog.22web.org/linex.pdfIn PDF document text
    • http://tesevamomavuruf.22web.org/28006099202.pdfIn PDF document text
    • https://cdn.sqhk.co/siwowoso/9YieVg5/pefafedezupiligima.pdfIn PDF document text
    • http://fc-aromat.ru/dinukekiwowegezukewavomul81m9q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molamizaxe.epizy.com/is_calm_sleep_app_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65be7d7a-7d25-4c20-bc31-7b12333c12ab/what_does_splitting_do_in_blackjack.pdfIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_7f4ce5f2ba2949ae9e066febaead6ed3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb338d56-f80d-40bf-9376-025c7ea00c56/grade_11_mathematics_textbook.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_d9afbc8060fc4631870a05af2ef18de2.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_172a1cd8933b44c88a0b1657623ae381.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3493c7-f59c-48cd-a2fa-b7c3e99f2e06/ponobajona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ab526a-1344-49fb-8caf-817207daacdd/26893026950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10dcd28f-76a0-4bde-8d8f-e1ba6c140dad/quote_red_queen_alice_wonderland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8afabcd-b9a7-4fa9-9813-482449f3c298/what_is_the_best_lightweight_upright_vacuum_cleaner.pdfIn PDF document text
    • http://wujitotulofok.rf.gd/pdf_bestand_kleiner_maken_zonder_kwaliteitsverlies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf7c34e-1508-4c90-a924-e41d693917fc/asp.net_mvc_core_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/509942df-7f8b-43ae-acbf-39fb59540321/how_to_be_a_caregiver_for_your_spouse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d3aab7-90f4-4447-a9b3-a23e8498e9ca/how_to_make_a_mayan_pyramid_out_of_sugar_cubes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9259545-3fb1-41bc-93fa-ca399ab4a14c/were_going_on_a_bear_hunt_topic_plan.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 5352 bytes
SHA-256: b7ec093f491e420ac5c2f8692576f1f5d56e28fe1448124eef135adc332027df
font_01_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 12004 bytes
SHA-256: dd1d192402969ce4bd3a486c9b224094444277dc8a82225b391ce4f36ac9cc1b