Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3608e6c8894230…

MALICIOUS

PDF

78.5 KB Created: 2021-05-28 09:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2c29077558dd0a90c5c1c8253959b269 SHA-1: 05f22d9f57f112370e160124e6a9e7749aeab0c2 SHA-256: 5b3608e6c8894230c6a35e2c77f8dd288e6b57273621e56e142e94fff0d58e67
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 6

  • 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.
  • 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=what+are+three+examples+of+non-verbal+communication PDF link annotation
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/5762342.pdfIn PDF document text
    • https://namodezax.weebly.com/uploads/1/3/6/0/136055978/8750726.pdfIn PDF document text
    • https://rurojuwonaluw.weebly.com/uploads/1/3/7/5/137510596/8842480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_5fcc612129565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_600f1a8152c89.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/wusani.pdfIn PDF document text
    • https://varavedonenen.weebly.com/uploads/1/3/4/3/134316352/dejozisaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482228/normal_603a0b01292ea.pdfIn PDF document text
    • https://vitiwujujoter.weebly.com/uploads/1/3/4/6/134659282/furepiw.pdfIn PDF document text
    • https://norokeveja.weebly.com/uploads/1/3/4/7/134706326/gutunasuzu_tepufelodekata_lotulutelofex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_602e39c9a66bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466659/normal_60380a3d499b2.pdfIn PDF document text
    • https://zikazofikadit.weebly.com/uploads/1/3/0/7/130739129/nebuzurevere.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/2ebc9486-7449-4549-9219-87438061141d/nafusenivasavolezunedur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688c8c85-bdc4-4404-ba38-7f3f38392d00/how_many_pressure_points_are_there_in_the_human_body.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/346fd5b2-9930-4390-a6fc-cd89b15c5a9d/music_mojo_all_songs_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/845d4808-9345-4e7c-81c7-f6a349355653/how_to_insert_text_into_a_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0fd3a2-11f8-4e68-8bae-2bc02484923f/36271297216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ba3944-f4c5-434e-816e-491bff78ec54/7993164014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f49e5c-0c74-4644-b529-cbcbb5bb6c32/dotalupefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcb7cd7c-d165-496b-83a7-39903bdcbb3f/82904547049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15a49bc-00b8-4f3c-9257-79a5a5f3b814/what_is_the_purpose_of_3_minute_step_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/918f19c6-2a7d-478f-88e4-2521f1fe92d9/what_does_a_special_education_instructional_aide_do.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_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 5568 bytes
SHA-256: 18e9d1814cf1b688ef48a79b589281a33e88b5d82ade124f9e7a66191838fa6c
font_01_sfnt_off00010869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 10508 bytes
SHA-256: 6ebcb7be2542e41d93609793a3c6db086a29419bd6cc326afcf29a97133179d3