Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7f2f6e28923f35…

MALICIOUS

PDF

81.5 KB Created: 2020-11-10 22:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 10bf0cefa6d61fb842caf0fd894efbc1 SHA-1: 14f3a550ac3f883813c7a36100f7c33bb66a8477 SHA-256: 5a7f2f6e28923f35f072f7719c3a0752c44fa927dca132305462e6ae15b03a34
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 0.9997

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://traffine.ru/123?keyword=eberron+map+of+aundair PDF link annotation
    • https://dasasaperot.weebly.com/uploads/1/3/4/6/134665710/3028675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f9a22e6de7ce.pdfIn PDF document text
    • https://rodekimixew.weebly.com/uploads/1/3/4/3/134314341/9843fcff17d844d.pdfIn PDF document text
    • https://wawukonuxoni.weebly.com/uploads/1/3/4/0/134095992/9550118.pdfIn PDF document text
    • https://javezevefumutew.weebly.com/uploads/1/3/2/7/132740470/dopawugix-febozivelutatin.pdfIn PDF document text
    • https://kisotupojez.weebly.com/uploads/1/3/4/4/134493444/aec8efac.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/7077449.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/fd1ad282-83df-41af-8eb4-807db4a9e621/zolufez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1b3f41-28bb-4a19-9253-3edc1b0c59b7/al_maestro_con_cario_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e798e58c-5f75-49cc-be40-d5a400a150c8/operations_with_exponents_math-_aids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03e4a61-e734-4261-98eb-c295d4758a2a/30695062151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c072d812-ad15-42a9-a9cd-345e18eb7423/ncg_theatres_lansing_mi.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_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 5072 bytes
SHA-256: 8c4f700ddff0397160d6faddcde3e5c8d93b60aeff8ccaf700448817baeaa1ce
font_01_sfnt_off000116bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BD 10152 bytes
SHA-256: 57e1cfcbe9961d45ebf7ea635ab9c61019f7d0a1e4701b7c5d5520c555c39b07

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