Malicious PDF — malware analysis report

Static analysis result for SHA-256 a863519f49cacac5…

MALICIOUS

PDF

103.1 KB Created: 2021-06-05 20:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f29df70546aa6a345916285e848fc7a4 SHA-1: a7ea1c279ef79fdc2d5eb3f47de86273087db840 SHA-256: a863519f49cacac551d8199c2a8d9b7ee98c6d2f2be431b7733e77aff3321413
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents hosted on various domains. The primary malicious URL identified is https://midufefew.ru/123, which is likely used to redirect users to further malicious content or phishing pages. The presence of a large number of external links and the ML classifier's high confidence score indicate a deliberate attempt to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/123?utm_term=jogos+de+moto+para+pc+fraco PDF link annotation
    • https://kukaweferoba.weebly.com/uploads/1/3/4/7/134754127/3957229.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417644/normal_5ff4cc6fb0675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_60ba8e253db9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495058/normal_6058951002a86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_603ce07346f87.pdfIn PDF document text
    • https://jategagimi.weebly.com/uploads/1/3/1/4/131437123/1840347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_606de5a5aa872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_5fd9687ddd9e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419225/normal_6053237583684.pdfIn PDF document text
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/de4d4b06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478933/normal_5fe3ff3c7b4a9.pdfIn PDF document text
    • https://vevusivo.weebly.com/uploads/1/3/0/8/130874001/6cf5def3063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499002/normal_60281d966219a.pdfIn PDF document text
    • https://xexibuwowixuzu.weebly.com/uploads/1/3/4/4/134455615/kafomodijuro.pdfIn PDF document text
    • https://ladubikoniku.weebly.com/uploads/1/3/0/9/130969526/8371730.pdfIn PDF document text
    • https://gimebupezepufo.weebly.com/uploads/1/3/4/5/134507041/fuzake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vifogajo.pbworks.com/f/xudibum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e08a9b7a-eeb1-4ff5-b351-ed2ad1c98cce/26774435572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be70536a-ae3a-452b-accc-786da60a60d3/south_indian_veg_starters_list.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/how_to_access_the_camera_on_hp_laptop.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/8060219288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c02ffeea-553b-4f68-b791-2de51a3498d5/navy_advancement_center_senior_chief_results.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/f/54403132266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeed9306-adcd-4570-8a82-0fac54fe97c1/activation_key_gta_5_mac.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/how_to_get_a_free_iphone_12_for_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BB 8016 bytes
SHA-256: 91b622c4cf26a141f028b1bfd411e94c2e9504bef2b414201c2b91e93472edfc
font_01_sfnt_off00013f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2B 5432 bytes
SHA-256: 25e6a20fbd8a7dbda2baceeaffc858d6bdf9ca76fa151cf74bd2154a4abe2ccb
font_02_sfnt_off0001518d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1518D 11244 bytes
SHA-256: 30695e942795ae575cb9d9fc1639a8a83e0f46c3c9a1e708f4f05c5a7b64dc5c
font_03_sfnt_off00017708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17708 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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