Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd40b3cd79c25e6…

MALICIOUS

PDF

37.4 KB Created: 2020-11-09 10:10:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 35d291176f44109cadff0090a22e2948 SHA-1: 92dfde12699c33d76c38ec4590ae87458de12ad3 SHA-256: fcd40b3cd79c25e6f8934964fb96df3ab8d2b6d8579330987a9e86994b0cb082
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be attempting to trick users into downloading a password-protected archive, which is a common tactic for evading gateway security. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://traffine.ru/123?keyword=ultimate+sonic+flash+code PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5fa5118294252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f9461000fab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5f91785fc1374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f88acf23642a.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/4209613b-261c-4e83-9be0-1b54b854c31e/dilulogotowaxatuxabewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f687b6a9-2bda-45a0-9bbc-08ab4dc0f819/80515821343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eaf59a5-48e1-48a9-990f-e2325411554b/truck_driver_trucking_accounting_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e453b0ba-3f54-4a86-8b30-7599691b47dc/Celebrit_libere_upskirt.pdfIn PDF document text
    • https://binitizuvex.files.wordpress.com/2020/11/masks_a_new_generation_unbound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1de0729-8f62-42cb-a461-8cfe2054c3e8/ey_numerical_reasoning_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f402441a-e93a-4e3d-a551-4764e84b1278/60803693743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e10a6d75-1ce5-429e-9fa1-8d6a4f5269d2/sezito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c5143f-b950-4283-8436-0286747ac07f/tarakopefuzuniwukurite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40dd6442-e2c3-4c35-ba88-cd07dfdf3d33/best_simpsons_gifts.pdfIn PDF document text
    • https://zisupaperuv.files.wordpress.com/2020/11/skylight_one_card_balance_check.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_off00005396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5396 5156 bytes
SHA-256: 98d266aaf2965755d08dff50e80b100f33af08fedd6b9f2df38aa61db3eb845b
font_01_sfnt_off000064fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FE 10128 bytes
SHA-256: 52e769c1469e0c777af18ee2c9976f771567664b4581f75887878a6bc4fb5662

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