Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca55e245b470182…

MALICIOUS

PDF

80.0 KB Created: 2021-02-16 08:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 638b5763f19e00110d125fecf86a9136 SHA-1: d66438f111bcc936bd1dadc0e394b010b6458771 SHA-256: aca55e245b4701826a3660dc4087acff6c38ce6f2afd07461f807577e0307bce
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a question about McDonald's employee pay, suggesting a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/strik?utm_term=how+do+mcdonald%2527s+pay+their+employees In PDF document text
    • http://natural-shop.info/topizy0luf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fe1cfd85d266.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/jagiLRs/speed_motors_largo_reviews.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/remove_curse_of_vanishing57x3h.pdfIn PDF document text
    • https://cdn.sqhk.co/dulinifijal/fhdjjAj/merchant_of_venice_text_with_paraphrase.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/jiZSrNq/eternal_cannon_strategy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425227/normal_5fce6d6f2e59e.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/powerpoint_templates_data_sciencelkc0o.pdfIn PDF document text
    • http://pl50off.info/inference_worksheetsw95j0.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/spnBicA/walesi_bardok_hany_versszak.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/gYm3icS/2445909922.pdfIn PDF document text
    • http://atlas-copco.su/presto_2000_timed_flow_tap3ec69.pdfIn PDF document text
    • http://herss.space/kaantasan_ng_pang_uri_worksheets_grade_7hirkl.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/dSn5gdd/jefigumilivuxikutiz.pdfIn PDF document text
    • https://cdn.sqhk.co/bejadelu/jjjijid/xubiduxaga.pdfIn PDF document text
    • http://rineset.xyz/catecismo_para_nios00edi.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/metubevozisul/mifiporivetipa.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/meluzutevujamewuf.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_off0000f98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 5504 bytes
SHA-256: edc2a82738056fcbabe595fe5a94588bc1491ba8f77e401f32e31102e1de46e7
font_01_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 11336 bytes
SHA-256: 18aaa2d1b3f8e708a27dfde808e3a617f218221769e39173dc38f443dadc1aa4

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