Malicious PDF — malware analysis report

Static analysis result for SHA-256 d025057a5b7f6822…

MALICIOUS

PDF

71.6 KB Created: 2021-02-10 20:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 42e9ddcad0dc7c146efc1866b2de1eef SHA-1: 042f897648adbbbf6e2d1b8fb52433101e611806 SHA-256: d025057a5b7f682232cb0bedf43c4abeda6a9fccd69cd88336aeea1368a2035c
214 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying it as a redirector link to malicious infrastructure. Another critical heuristic indicates a link farm, suggesting an attempt to manipulate search engine results or distribute multiple malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=brochure%20template%20word%202010 In PDF document text
    • http://ozalupa.space/ignore_the_guy_get_the_guy_ebookh6rg7.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/5CGdJzp/kamigemaxawebuwonuwewajav.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/2n1tIih/unicorn_horse_games.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/jfUidHz/uncivilized_meaning_in_telugu.pdfIn PDF document text
    • https://weligolujevis.weebly.com/uploads/1/3/4/7/134748453/6002526.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/tokudapele/standard_employment_reference_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/pfms_generated_payment_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/business_proposal_letter_template_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/acellus_answers_personal_finance.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/canada_post_mail_forwarding_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/free_menu_template_photoshop.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/delicious_world_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/43489672895.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/vaxobaka.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_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 5604 bytes
SHA-256: 999dee9115df616592facf1a74f280874ad0552fac7b08adbdcaa2a3e9eded64
font_01_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 10380 bytes
SHA-256: f5bc973c396bfb0dcf997aa415372e799d04f3cba0f254f876f4a6751817df1e

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