Malicious PDF — malware analysis report

Static analysis result for SHA-256 389644e5a10f9804…

MALICIOUS

PDF

79.1 KB Created: 2021-03-13 22:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 01987bd567a101d2051ea53d8b77a15d SHA-1: de686ff68b926d97a4766068ebed3bc00c41f932 SHA-256: 389644e5a10f98049b059627016d90752f46fa10a52962a56db685a3c656bf6a
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 0.9992

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://dugedepap.ru/strik?utm_term=manual+de+supervivencia+de+ned+capitulo+final PDF link annotation
    • https://cdn.sqhk.co/telazaje/iqsu9ji/41071424027.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/iijlzhf/drum_pad_machine_for_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/litopozuf/jghagde/rudimorona.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/7ce36eed-ebeb-48d0-8a31-c078d0f67c07/27004252474.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_44be885cfedd4b3fac7d0258d7c24610.pdf?index=trueIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_3c202f0d461d4f6183a7e1087dfaaba1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/nyc_bike_path_map.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/how_to_install_turbo_c_compiler_in_windows_10.pdfIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_d8e0b00e84a74a93a10a47a6a4244f47.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d338636-3f14-4a5e-8dfb-c6c442d1c136/vobipepazorudoxoxiv.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_2a7b1eaa9cbe446aa188e7f7a23ddffc.pdf?index=trueIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_57d47daa235a4ea889b79778a5be3360.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f00fb99-247c-4f19-b869-cdbd95396522/79106012275.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_ebf64591172b4c3ebafec5c4b5afdcbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/table_of_contents_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/abu_garcia_elite_max_spinning_reel_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/598a6448-d7e9-4393-ba7a-b92572f57c3d/65740440521.pdfIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_941a9eba899449a18c5f9aa4ccac4f6c.pdf?index=trueIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_01b5217433aa4a54832258e2b4a6ba16.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_4fb2cb79db8e42d3ab2587af67256657.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_3c7b3366db7b4cc991c3a15095b4e2a6.pdf?index=trueIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_1db60407a6e845fb9aab4d089e149b48.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_e93eaa6285004a4d9e4cbc2657d37bb4.pdf?index=trueIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_c756677134214e61bf4bb93679adcdf5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/xotowugepalil.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_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 5212 bytes
SHA-256: 66cfcaa0c767185d57516f7f1795888983896b0e0c7d15c5080056ce84b190cd
font_01_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 12716 bytes
SHA-256: 0a223f3e39f919e5d46d4c1aba59f3f4c964371bf742788a3ff4cb1f72742a31