Malicious PDF — malware analysis report

Static analysis result for SHA-256 6133fd0cb7fdbd50…

MALICIOUS

PDF

74.8 KB Created: 2021-03-31 05:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b524bf1fa8a5bbd1796a725405926c1e SHA-1: d53ab9d645a12dc9e2fafcbadc4086afab086de8 SHA-256: 6133fd0cb7fdbd509b8cb358a8f8a3cdd15b08e0cd2160e6ca452705352b08b9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary external URI pointing to 'https://baarspo.ru/123?utm_term=basics+of+internet+and+networking+pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://baarspo.ru/123?utm_term=basics+of+internet+and+networking+pdf PDF link annotation
    • https://cdn.sqhk.co/wabasenenem/AXQZieK/bowimajevokevomuxu.pdfIn PDF document text
    • http://dokeximikeveved.iblogger.org/odisseia_homero_download.pdfIn PDF document text
    • http://disujexa.22web.org/online_platform_ticket_booking_delhi.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/WjhKqJz/globe_at_home_login_app.pdfIn PDF document text
    • http://nuvuxek.iblogger.org/xotubixetaxinavulij.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/30f4idc/32385804074.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/yFicmtB/pisewotelebagamomu.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/hbTJ2ih/how_to_block_websites_on_android_google.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/jfFfKS3/100_embroidery_stitches_book.pdfIn PDF document text
    • https://cdn.sqhk.co/winanuwumovu/4pbFoid/security_risk_assessment_report_sample.pdfIn PDF document text
    • http://wovogabaposexe.22web.org/vosinodomavefixokegebe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sedoguzod.rf.gd/citroen_c5_2007_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78707f36-eb07-4a2e-a2ef-7d8bb27d3edd/58993660613.pdfIn PDF document text
    • http://xiwezolemamu.rf.gd/jump_zone_15_trampoline_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6255561b-792f-4e7a-8390-d6f2ab50713c/roman_mythology_stories_tagalog.pdfIn PDF document text
    • http://malejuvi.epizy.com/a_streetcar_named_desire_set_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/651cf829-f6d2-4d6c-b741-f339defc4d23/raving_fans_sparknotes.pdfIn PDF document text
    • http://bogibil.rf.gd/coding_interview_python.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4b8c01-49f8-4ed7-ab62-acdc9a150241/fighter_gunslinger_5e_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7faf708-35d8-42c4-a819-3b163ca3d64c/is_sage_crm_any_good.pdfIn PDF document text
    • http://gikosetopetidun.rf.gd/vuboluzolidemux.pdfIn PDF document text
    • http://badizep.epizy.com/bernette_500_deco_embroidery_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae445cb8-72ce-4dbb-9da6-7e5ea1379a2d/pelugurox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 5284 bytes
SHA-256: e55e8edafe9b9fa05088858c0c769af874eaf06d7f1248097b7e263818337b16
font_01_sfnt_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 10656 bytes
SHA-256: 11d9997b8bf4fc6211571d9e425ef567326b8a2605c986dc66c0760190561a2e
font_02_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71