Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b719aedff37027…

MALICIOUS

PDF

74.0 KB Created: 2021-05-12 17:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6cfb7042e5fa5ef9236875448de98604 SHA-1: b0259be2d212ae31c1169e0b4caa5fa9fa21e636 SHA-256: f8b719aedff37027a04e32c59e8e44732061d1d30b77e7ee731b2fbd2b443182
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 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=2012+dodge+durango+rt+recalls PDF link annotation
    • http://itravelimpressions.com/vifufisufejidelilivekilevfh45v.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/f5y7Jgf/51823920461.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/demob.pdfIn PDF document text
    • http://firstdoctor.xyz/what_is_the_purpose_of_a_concordance8fjgy.pdfIn PDF document text
    • http://pelistens.xyz/the_essential_epicurus_epubbrjgq.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/vesawejeviji-vukakalexibok.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/6dihhim/pamiwesowa.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/hb9ie82/kopifafizo.pdfIn PDF document text
    • http://dasazopemobor.mywebcommunity.org/adjetivos_en_frances.pdfIn PDF document text
    • http://byseles.xyz/76043816702wtdye.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/sabupib.pdfIn PDF document text
    • http://albatros-trans.ru/46680130198g5r51.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/17b24cae-af16-41b2-a114-edfa8683c72d/how_to_reset_rca_tv_antenna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8a33c5-84fc-46fd-a9a0-e03360a86915/xawugofifolomiripenem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ebd096-ca3a-4d05-8120-c72da8d21fef/80920348592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90042a50-0afd-47fe-a892-f235b6ea66e7/how_to_get_free_metro_pcs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34059ab5-f1d2-4d9b-b12b-8081d95999bb/rotafiz.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_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 5336 bytes
SHA-256: 6699ef7c5d535ab7215bbf749c8de4a2ad62cec20eba161e905c6aaa9567cd56
font_01_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 10568 bytes
SHA-256: c120b7f1bbad2e31f8c4db3a1fd0612aae6e984293addded2ad9b3d7a2839583

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