Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3b0b9015669a0b…

MALICIOUS

PDF

72.5 KB Created: 2021-04-06 00:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4f144c0e2ea8f77851216efffb4c9798 SHA-1: 93e942690cfdd10c0b9fa7e6aff99c4a8f466a25 SHA-256: 0f3b0b9015669a0bd51229fe3f58c19168b45d7970ebf3f87860c56fb929c119
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://gimoguvi.ru/strik?utm_term=monkey+business+lyrics+mj PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470389/normal_5fffe8443b309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_601bb85ebc894.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojevevoxo/KheD9ii/best_romantic_ringtone_for_mobile_download.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/loxawo_burexav_momubelexivi_mitirurop.pdfIn PDF document text
    • https://wipabobape.weebly.com/uploads/1/3/5/9/135985954/dimuxinel.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/majhKjb/mabevisi.pdfIn PDF document text
    • https://cdn.sqhk.co/mojerakikav/2hczhiv/kazubatudoranilovuv.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/khhoqZY/batizamuderupel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383679/normal_6001a9647ed14.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/poXpfih/dining_room_chairs_set_of_4_brown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_2cd19f9b5b80487baa1637186e960701.pdf?index=trueIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_b40fcf63084941a687fd536b9e47f4c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/83546578507.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/freak_the_mighty_book_vs_movie_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/interview_questions_for_accounting_clerk_and_answers.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_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 5120 bytes
SHA-256: c21bb49fdd1626080040f841321842d681b77b437cd449f64143543c9f07c7b9
font_01_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 10380 bytes
SHA-256: 76cee606ad987bc6bce9db5bd771f65c1fcb4ecdd6c134858a32b886fd63be67

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