Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd05ed73e5d511d3…

MALICIOUS

PDF

66.8 KB Created: 2021-02-19 19:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f9e98e2c6e803b76a7da3bbcdd8e05f3 SHA-1: 76a7e799e811563a26393a35298d5ceee7ee4d27 SHA-256: dd05ed73e5d511d380711572a620f3931d2a9b222a72a292da72fe750186d3ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to drive traffic to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wix?keyword=classifying+animals+worksheet PDF link annotation
    • http://ing-cliente.com/870292609056ftd4.pdfIn PDF document text
    • https://fuxexitir.weebly.com/uploads/1/3/4/0/134098624/vinupigovagi.pdfIn PDF document text
    • http://tameeniraq.com/tylex_30mg_bulamiglo.pdfIn PDF document text
    • https://xovewelokajefi.weebly.com/uploads/1/3/4/8/134864882/b6b77fc3330.pdfIn PDF document text
    • http://zarabotok.space/aadhar_card_form_in_gujaratihqn1p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_6029de12936e8.pdfIn PDF document text
    • https://sevezumu.weebly.com/uploads/1/3/2/7/132710575/guxadunozubirorop.pdfIn PDF document text
    • https://nexitikobimefa.weebly.com/uploads/1/3/0/7/130776699/6866775.pdfIn PDF document text
    • http://itasummer.fun/bokoxepesobuduzubufupvf7uo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/47951258980.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/95520786777.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/4049406260.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/checkbox_value_html_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/69969173832.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_off0000c9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AC 5344 bytes
SHA-256: 0d707bde811dff40f97c6d8de6baf99c32626716d93855dd0deb62a69bd946ce
font_01_sfnt_off0000dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC8 10240 bytes
SHA-256: db9ca5802d0a3ee818d82c6b150fff9535b7e3ceb3c415f0a35e696efb74555d

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