Malicious PDF — malware analysis report

Static analysis result for SHA-256 451f2fb1e3ed1cb1…

MALICIOUS

PDF

92.9 KB Created: 2021-03-24 21:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d8902f617c4d868dda655b6c28798a9c SHA-1: 50ad27dfe681fa35d0d53a6b8254da149e022d71 SHA-256: 451f2fb1e3ed1cb19b73a34494483ff7775d93650770381b34324a40a69c0d75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://ponafet.ru/123?utm_term=wow+classic+dungeon+guide+by+level PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503197/normal_6032fa980a652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464525/normal_60191fe58c14e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453327/normal_60250e5ef1386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_6018bf5e42cea.pdfIn PDF document text
    • https://zanirifut.weebly.com/uploads/1/3/1/4/131407922/raledagosak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_603a9c15a7d86.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/hdhjghQ/hit_new_songs_tamil.pdfIn PDF document text
    • https://liwevifan.weebly.com/uploads/1/3/4/4/134477176/pemiwivopigiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_601ead247440b.pdfIn PDF document text
    • https://cdn.sqhk.co/wesegagage/7ii0nC9/alphabet_learning_games_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485015/normal_603ad0ab48e32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafelen.epizy.com/luwafezivajofujogetazara.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_2ce8f35f8fcd4c2a8ceb15091b6adf0e.pdf?index=trueIn PDF document text
    • http://nepupiborama.rf.gd/gevubatoteratiraduso.pdfIn PDF document text
    • http://silimefepil.rf.gd/food_chain_worksheets_5th_grade.pdfIn PDF document text
    • http://gakowutegufez.rf.gd/87858523025.pdfIn PDF document text
    • https://1f53f175-067f-4140-b001-f66bebc9855b.filesusr.com/ugd/c711d8_fa795013e37b42ad94c614ea068c7e8e.pdf?index=trueIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_9f73b01497ca4486b1ecbe74a2988ced.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_off00012f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F42 5420 bytes
SHA-256: e6fae42625a051c2fee92bd1ce11bac2c48eb0ab04faf59bb043ccfbb9fc7dd8
font_01_sfnt_off000141e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E5 10652 bytes
SHA-256: c07da74686e9df2d8eff24a09fe9893a821a3b1bd35842ad20bd1ef5b027a8da