Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8d0aa71e7146ec…

MALICIOUS

PDF

121.4 KB Created: 2021-06-01 10:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0ffd41b89c9632e6a3199b9fe90fab63 SHA-1: 539028373409aecb26096ef82f0341d50d0174c8 SHA-256: bf8d0aa71e7146ec7b623ac368327122a9c0d42a9b8fec79ecb086dbca3115a3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is not a legitimate document but rather a tool for SEO manipulation or distributing malicious content. The presence of 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' further confirms its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kokarino.weebly.com/uploads/1/3/5/2/135299240/6308345.pdf In PDF document text
    • https://vivifaxokuz.weebly.com/uploads/1/3/4/5/134511129/2aaa26ab8463.pdfIn PDF document text
    • https://lepomanorep.weebly.com/uploads/1/3/4/8/134856804/8990930.pdfIn PDF document text
    • https://kulijigixasita.weebly.com/uploads/1/3/4/6/134669238/zuvoda.pdfIn PDF document text
    • https://solejibanumiro.weebly.com/uploads/1/3/4/4/134489880/e531c8ba6.pdfIn PDF document text
    • https://koxamuru.weebly.com/uploads/1/3/4/8/134890845/a2167258bb.pdfIn PDF document text
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/nibiwofusiv.pdfIn PDF document text
    • https://pistant.ru/pbw?utm_term=%25D0%25B2%25D1%2585%25D0%25BE%25D0%25B4%25D0%25BD%25D0%25B0%25D1%258F+%25D0%25BA%25D0%25BE%25D0%25BD%25D1%2582%25D1%2580%25D0%25BE%25D0%25BB%25D1%258C%25D0%25BD%25D0%25B0%25D1%258F+%25D1%2580%25D0%25B0%25D0%25B1%25D0%25BE%25D1%2582%25D0%25B0+%25D0%25BF%25D0%25BE+%25D0%25B0%25D0%25BD%25D0%25B3%25D0%25BB%25D0%25B8%25D0%25B9%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC%25D1%2583+%25D1%258F%25D0%25B7%25D1%258B%25D0%25BA%25D1%2583+6+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581%25D1%2581+%25D0%25BA%25D0%25BE%25D0%25BC%25D0%25B0%25D1%2580%25D0%25BE%25D0%25B2%25D0%25B0In PDF document text
    • https://pistant.ru/pbw?utm_term=%25D0%25B2%25D1%2585%25D0%25BE%25D0%25B4%25D0%25BD%25D0%25B0%25D1%258F+%25D0%25BA%25D0%25BE%25D0%25BD%25D1%2582%25D1%2580%25D0%25BE%25D0%25BB%25D1%258C%25D0%25BD%25D0%25B0%25D1%258F+%25D1%2580%25D0%25B0%25D0%25B1%25D0%25BE%25D1%2582%25D0%25B0+%25D0%25BF%25D0%25BE+%25D0%25B0%25D0%25BD%25D0%25B3%25D0%25BB%25D0%25B8%25D0%25B9%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC%25D1%2583+%25D1%258F%25D0%25B7%25D1%258B%25D0%25BA%25D1%2583+6+%25D0%25BA%25D0%25BB%25D0%25B0%25D1%2581PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuvebag.pbworks.com/f/mejevisugaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edeb7260-8fb9-469e-84f0-5d85c14f16aa/how_to_use_onenote_effectively_at_work.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144421038/rotarulime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d088ab90-ed6d-4e87-88c1-736bb3e4c450/28463004748.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/what_does_it_mean_when_your_tv_flashes_red.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144443325/que_es_sentido_literal_y_sentido_figurado.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144431295/bineriwawog.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144435495/pokemon_diamond_and_pearl_download_gba_rom_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c6a920-6f10-4f0c-876a-841cd5d8a890/what_is_the_moral_of_why_mosquitoes_buzz_in_peoples_ears.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aef0ea9-28cf-4599-b198-64bfcb48e7e6/visaxifuwitisamuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f841000-82eb-45bc-bb46-4751728099f4/download_gimp_2.8_18.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144421527/calibri_bold_font_free_download_mac_os_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14b9742-aec1-4b71-82d6-05931aa1a578/32142597787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce30cbed-be2d-4ef2-ac00-c3582fe26217/dusopifukij.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_off000186ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186ED 6612 bytes
SHA-256: 53f83d03e8098871f2df161b3ef8467c9644c26d6dda10aa79000e686503c3be
font_01_sfnt_off00019d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D1C 17616 bytes
SHA-256: 0bd6b81ca10cc7102bb9025fdecfd5da83f2108a405765ead202c30ac8723d58

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