Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53c737782d05e12…

MALICIOUS

PDF

72.7 KB Created: 2021-02-18 20:20:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 683828efb6ad9e40ef8128bc2f3492e9 SHA-1: 90b5211c4ca2dd4587ca71ea6761eb0eac5e8845 SHA-256: f53c737782d05e12ee4c4324cb1d7d46e9e4e169a8634f8f66cdd0265c4411af
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://jacksth.ru/123?utm_term=harry+potter+book+author PDF link annotation
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/vizimoxepo-malituxuxevujo.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/DgejjmC/talking_catfish_tank_mates.pdfIn PDF document text
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/4065458.pdfIn PDF document text
    • http://xomapometafa.iblogger.org/1809286474.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/xVsjbhc/63526917650.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5ff4c4c9aa03c.pdfIn PDF document text
    • https://tiwixuferexo.weebly.com/uploads/1/3/1/3/131380596/kumim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_6019f1cf06f87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mepivew.epizy.com/calling_in_sick_worksheet.pdfIn PDF document text
    • http://nenunosulijud.rf.gd/free_font_bebas_neue_light.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/34070336148.pdfIn PDF document text
    • http://rigirulame.epizy.com/paresutamix.pdfIn PDF document text
    • http://pokatutabojew.rf.gd/unlock_your_dreams_barbie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/71222471852.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/baby_video_songs_hd.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_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 4964 bytes
SHA-256: 473aabaeb109ef6d9b0c3f09135739a8a9fd93186380e6299fd570c44f6dfdd8
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 10296 bytes
SHA-256: 6f6f1813aca3aeb66591dde36f4df041bda6a61ca74b3d0083a3a062ab20a2c2

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