Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5e87a871e71cbb…

MALICIOUS

PDF

99.0 KB Created: 2021-05-25 02:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 043e583e5800f5bb9f4ec1400b09a4da SHA-1: 8f23b4efbbbbf2d47c5ce51b0f1ee95e0107b7de SHA-256: 6d5e87a871e71cbb44b32a1a3e32492c8550b32cc1a37271418459e2d71a897a
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 0.9990

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://midufefew.ru/strik?utm_term=ryan+kerrigan+wife PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5fd1e589d2a55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370299/normal_600985a57edaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_606016a17a5a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495994/normal_5fec1f153d9c7.pdfIn PDF document text
    • https://worizura.weebly.com/uploads/1/3/1/4/131437573/9604568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_60605c1fdb66f.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/nivagusepedotof-metifi-fidave-vurilulot.pdfIn PDF document text
    • https://babulavired.weebly.com/uploads/1/3/0/7/130775389/403057.pdfIn PDF document text
    • https://lonitavow.weebly.com/uploads/1/3/4/3/134355974/fuwutebelunuduwadami.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5fdd3df45e10a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445324/normal_60608b19da434.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
    • https://uploads.strikinglycdn.com/files/572af3c2-2db9-4a74-abf5-cd37b5f1063a/heroes_of_olympus_book_2_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/how_to_register_presonus_audiobox_usb_96.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1826bfeb-0802-4262-8e15-2734c54cdb43/zikatetexopowufo.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/hand_held_sheet_metal_folder.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/how_to_find_penny_stocks.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/what_is_a_transition_in_screenwriting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9b0434-7ad2-4c6f-be2e-e5601c7b6eb2/my_heart_and_other_black_holes_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fafaa6f-6449-4516-a987-b39c1cef09fd/what_does_economic_impact_mean_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5900e797-ffd9-47b7-ab0c-070ba836d5b3/mary_poppins_full_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77bf442d-60f1-4d83-80f3-4a013072b7fb/fupemivogepogugalinisad.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/redotadokotusixowasakub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109680ec-2087-477e-925a-59614247653d/81981207362.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_off000137ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EA 4588 bytes
SHA-256: 82635cd3fce061baf02d5623f1d92cce155c0e292777fb19d372016e6d2b415a
font_01_sfnt_off0001479e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479E 11596 bytes
SHA-256: b6cd842638d7524382dcc181fe4863a9d93aba90df1ab15ec8e38c6903bec251
font_02_sfnt_off00016f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F33 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361