Malicious PDF — malware analysis report

Static analysis result for SHA-256 143e3801244019f6…

MALICIOUS

PDF

86.5 KB Created: 2021-03-23 10:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: da27bc2dbdca35e1bf9427ff70b9dc34 SHA-1: 9b31b230a9d4cc356dbbfc0253600dfea095fefa SHA-256: 143e3801244019f66ba23f2003da3f1339502b6d31e8137ac26078b839ff2b33
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, some of which appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the attack by directing users to potentially malicious content.

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://resalured.ru/award?keyword=annecy+france+map+pdf PDF link annotation
    • http://fly-drive.online/384324089671mun8.pdfIn PDF document text
    • http://shoop-fh.ru/how_to_turn_off_audio_guide_on_samsung_tvvg2jg.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/xananiwitajikupumi.pdfIn PDF document text
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/0e9d827.pdfIn PDF document text
    • http://italy50wow.pro/fire_emblem_three_houses_endings_guidegwuvp.pdfIn PDF document text
    • https://kadonomu.weebly.com/uploads/1/3/1/4/131454950/034fc0d768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470688/normal_5ff1c643554e9.pdfIn PDF document text
    • https://potuvomominoneb.weebly.com/uploads/1/3/2/6/132683031/vegetitusenufi.pdfIn PDF document text
    • http://meetchat.space/809798125197bjla.pdfIn PDF document text
    • https://bibevugu.weebly.com/uploads/1/3/1/4/131406802/redujafesur-pusafe-dorepedumab-tavepupati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_602155875de46.pdfIn PDF document text
    • http://raisinslabs.club/computer_is_beneficial_for_studentsuj48w.pdfIn PDF document text
    • https://fuwelobuzade.weebly.com/uploads/1/3/4/6/134649994/4518300.pdfIn PDF document text
    • http://best-store.club/fastest_way_to_pass_security_exam8g6a8.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/pobokaganijodusuzet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_602aeb53dadd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_600a5ba494a55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486037/normal_6050e913421c7.pdfIn PDF document text
    • http://hugertely.xyz/wawudukugx4q3y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://576979ff-f939-4980-8793-4b7993fae0a8.filesusr.com/ugd/14903d_d5bf191f6cda4561a50027d3d3480ada.pdf?index=trueIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_48c54cb928ec47d89be29521600c0bf1.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_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 5184 bytes
SHA-256: 7799a36a84d87f35cfd67dee9beb98af9a21bd7836730356c3b7b634d7997a62
font_01_sfnt_off000121ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AC 13980 bytes
SHA-256: 0fa2fd5e5467213fd3b8b8794ca209be29cdbf5097b234a36cea5c36769027e2

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