Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f187c3341e15b80…

MALICIOUS

PDF

74.1 KB Created: 2021-04-08 21:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1cf40e90bc9edd13aabcc89d006ae3ad SHA-1: c5fc5b6a2d829e86f754da9a23437ebd7b46d249 SHA-256: 2f187c3341e15b80730c8ba359d29824824c6cfcd58fd7d86b1cd6abc7e30514
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://jacksth.ru/strik?utm_term=when+to+change+transmission+fluid+vw+jetta PDF link annotation
    • http://liketime.online/nemivebowukiwuse7gpmb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_603845aa60bee.pdfIn PDF document text
    • http://fasad-dom.site/jotul_f100_nordic_review5suqs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_603c0298b4e06.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/kolidaluk.pdfIn PDF document text
    • http://workbykoder.xyz/86775837390zdwef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_601d6f1e61024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469374/normal_601dff15bac52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_6011c8879a7d8.pdfIn PDF document text
    • http://tehnotop.site/can_democracy_survive_global_capitalism52mq6.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/39342699225pn5uc.pdfIn PDF document text
    • http://kalavar.xyz/vojejadikudorlaht.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_60339165207fc.pdfIn PDF document text
    • https://lerafajim.weebly.com/uploads/1/3/4/6/134667367/worupe-tukugi.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/d053c258-6d09-49aa-8cac-28e5fc091736/lidudadajejedivoregefolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ec38c2-4b38-40a4-98c1-7bcf061c4585/daxufusemubujup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3f2228-6855-42e6-b22f-688950e02195/349434431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/728d9323-37b9-43bc-8fc1-f52fdbedab5a/tokyo_ghoul_anime_season_2_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb1f2cc-6558-436f-abae-395387ec105a/how_do_i_use_my_aroma_professional_rice_cooker.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_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 5676 bytes
SHA-256: 34e4628ef0c76ec8784c546ed4dd4e675d880ebf25b0f08747b7a074dce331c7
font_01_sfnt_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 10316 bytes
SHA-256: d7b7d8c4c5558bf3962646ba9a8178976eab30d0f6bfc02246940163c56c3659

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