Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fc276ef7e9da86…

MALICIOUS

PDF

85.8 KB Created: 2021-03-10 18:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 37dfab49ff7df20b0caeab164163319e SHA-1: d7c8823fc64e4424c675619f822882f02ca33cfc SHA-256: 50fc276ef7e9da863a46388cd50d601c0ff318371a6bbf01b70340a7528e0fa2
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm, indicating a phishing or SEO manipulation scheme. ClamAV also detected it as a phishing trojan. The embedded document body, though heavily obfuscated, contains keywords related to maps and applications, suggesting a lure.

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 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/wix?keyword=palm+beach+county+map+pdf In PDF document text
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/jixuga.pdfIn PDF document text
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/2892561.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464315/normal_5fcbd0f5b6451.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5fef5fadd8b85.pdfIn PDF document text
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/xoseneketenazoni.pdfIn PDF document text
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/misubopavibukov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419826/normal_602da17acd6d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365598/normal_5ff04c2cdac0d.pdfIn PDF document text
    • http://xarusogu.22web.org/best_expense_report_app_free.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/mubemutolewe/gabrielle_aplin_waking_up_slow.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/pozujened.pdfIn PDF document text
    • http://gizexagivet.rf.gd/45021363119.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/lirufirubojusutisolurezi.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/rugelisipobal.pdfIn PDF document text
    • http://bukusisege.rf.gd/johnsonville_breakfast_sausage_nutrition_information.pdfIn PDF document text
    • http://vozofukoti.rf.gd/notes_forms_of_energy_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/basic_immunology_mcqs_with_answers.pdfIn PDF document text
    • http://xuvunemomot.epizy.com/56307533858.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/18041976778.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_off0001142a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142A 5364 bytes
SHA-256: d0fe1eb33395585cd9c47750ecd36abae734e649ea7779e0909d4a307e4a7146
font_01_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 10496 bytes
SHA-256: b5a37d79c731f87d122f00b526773ddf7c66c5cc1aefd8fd23479b21267cfa91

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