Malicious PDF — malware analysis report

Static analysis result for SHA-256 f920c3b64061f80a…

MALICIOUS

PDF

67.6 KB Created: 2021-05-15 18:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 398a438560cefb342c6f0aaae72f3b4b SHA-1: 75218f980befdc2d9592e664700dc170108ab7aa SHA-256: f920c3b64061f80ab7f10b39b9484fc39dc9a9c5ba7e04d695d908c35cd0f1d0
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to a suspicious domain ('midufefew.ru'). The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=fs-gt3c+manual+pdf PDF link annotation
    • http://goodnaturak.space/306338361941or36.pdfIn PDF document text
    • http://duplicwcnj.space/how_to_find_potential_difference_from_electric_fieldsy4bj.pdfIn PDF document text
    • http://badge-verification-center.com/what_type_of_food_should_blood_group_b_positive_eatn1fph.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/what_skills_does_a_pr_person_need.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/dha_multan_villas_balloting_form.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_a527ee31310a4f22bd135a880cc6aae9.pdf?index=trueIn PDF document text
    • https://2e4b0ed6-c237-476e-b23b-7c95f147629f.filesusr.com/ugd/30e930_cce8c058403e4eaaa4206eecb392c102.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_5ffc3917946e40708f7df0c68e4124a2.pdf?index=trueIn PDF document text
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_233d7f9f74fa4ee0a30a1cececdcf277.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomepixo/52112648715.pdfIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_1a3cc9e867404de8aa1795cca471854f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/ipad_mini_4_case_for_apple_pencil.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_d5563f9807074776a65fe5147607dd49.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_99d21309b8324ba6835990028464a6ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/91425335683.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_9d307fd68b1941418367377288ee1bfe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/hotstar_movie_link.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_5c921c60387f4b8bab5f03abc32acc8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nagudo/how_to_turn_off_olympus_digital_voice_recorder.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_9f4c431b4ebc4f3394137e93ca441982.pdf?index=trueIn 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_off0000ca90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA90 5528 bytes
SHA-256: 475cc645698c097b066a214b353c1b044ee7ceff9a600f049b2873520fc6a78b
font_01_sfnt_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 10604 bytes
SHA-256: f1e54baf3853489f30c3331ed55d0d0ac400394f442c54b472ba18c0b3451389

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