Malicious PDF — malware analysis report

Static analysis result for SHA-256 4809e3038cb19a0a…

MALICIOUS

PDF

74.3 KB Created: 2021-05-24 21:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 94d31f9c11ece4b1f1ad0054c34e62cf SHA-1: 3946eb4ea87d1477e4fb0ab26d5d729d1f616b3a SHA-256: 4809e3038cb19a0a185325157868e1502d47507bb63fe9b1d39267b3d5798e86
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. 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 0.9993

Heuristics 7

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://leonvi.ru/strik?utm_term=how+to+make+jan+aadhar+card+online PDF link annotation
    • https://tijabitosivu.weebly.com/uploads/1/3/4/3/134396728/beruboru_falerosijej_wabujuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_604d209e0000e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450883/normal_606e0ce90d909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_5fdc4651072fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_606b4786beca3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417025/normal_5ffd42029ac50.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/bodewikizib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5fcba00fbcfeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_605c61d86aa44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488329/normal_6045e8d0ba823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490122/normal_5fde3b84b2ac7.pdfIn PDF document text
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/8908987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_60390d4386c09.pdfIn PDF document text
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/5879261.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/rejufot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9237e288-f707-401e-bd4c-00453f4391de/some_basic_concepts_of_organic_chemistry_class_11_notes_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/how_to_use_scotts_standard_broadcast_spreader.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/pesubedaxasominur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f8d49a-4dbe-4609-a98b-5364a65f47b1/how_to_generate_function_in_matlab.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/46532503572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233ebf29-d458-45b9-b252-d935d1435d17/how_do_i_set_the_analog_time_on_my_g_shock_ga_110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6af47cc-3306-4c1a-814f-4a0337a0ae82/how_to_fix_soft_close_toilet_seat_caroma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd0a6b7-bbf2-4a3b-bc66-bbb1a7ee6b26/36528826781.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_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 5196 bytes
SHA-256: fa9af80072f42d501b9a318de3b998de8fbea4811731926d2c23345401fc5e26
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 10468 bytes
SHA-256: 93767996504cd9fb2b648101953678aecd1f74d045d9015c01665563e7957716