Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1d3c469d7c8e99…

MALICIOUS

PDF

74.8 KB Created: 2021-05-20 06:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5e0ea3baa9f36854fe2eab2e941674df SHA-1: 80f609d197e7a8dbaba6ceb0725b44cdcb3b6754 SHA-256: 2a1d3c469d7c8e99bb7058da18a5302e2fb37b781128bc0ad9aeec63129635bd
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://bologen.ru/strik?utm_term=what+are+the+main+characteristics+of+ecotourism PDF link annotation
    • https://dakuwenodamemu.weebly.com/uploads/1/3/5/3/135312817/butijamef.pdfIn PDF document text
    • https://lanulizuxuja.weebly.com/uploads/1/3/4/6/134658029/0a3dcf288cd4.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/tinanugufil-birolegof.pdfIn PDF document text
    • https://fabupegux.weebly.com/uploads/1/3/4/6/134689396/64ded530584067.pdfIn PDF document text
    • https://mubisajapesufu.weebly.com/uploads/1/3/4/6/134620746/gefanivemuf_guwajibukalo.pdfIn PDF document text
    • https://zibomuloxeju.weebly.com/uploads/1/3/2/8/132815028/9740877.pdfIn PDF document text
    • https://tegimawemax.weebly.com/uploads/1/3/1/3/131383609/1518550.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/803a2c2e-96b1-47d6-a39b-1f4ebe3b7a51/outlander_books_in_order_diana_gabaldon.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/espresso_test_android_kotlin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4efb5d5c-e728-4ee4-9d3f-2fb5dee35603/95287384801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb1a74f-c8e5-4dfd-b79f-7e2bd2fa97b1/81462786540.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/32228694077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d13586a-d6f1-4650-a842-5b614ac1059f/85235636702.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/79743545973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/401a0e11-74d2-496c-b960-cc28726cd23f/the_poem_in_flanders_fields_was_written_during.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/dancing_line_the_winter_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/30_day_green_smoothie_diet_results.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/pioneer_vsx_524_k_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52462fc3-d722-437a-849c-e397f5ffc08f/mofatif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965a4945-1e2c-4b2c-bf48-33ef47a80776/beats_solo_3_wireless_black_friday_price.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/95373106187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73983cf8-6e5e-4dce-a886-f05d072ea578/dipipixolofisatazidunile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7711e13f-a27b-4957-96fe-e15c28a7b56c/what_to_eat_that_is_gluten_and_dairy_free.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_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 5100 bytes
SHA-256: 77a9be040c3041cdbc8cd61d732914d3ac34cca4f0e2abced7ea0490a3d87f70
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 10380 bytes
SHA-256: 123cdc9231d14b81a3a0eae40db32830339ee9842c972eb183cafbcc2560d6e8