Malicious PDF — malware analysis report

Static analysis result for SHA-256 a448d368cf377d18…

MALICIOUS

PDF

79.2 KB Created: 2021-05-18 14:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8cf1fad74920e608acc87f6ac0f537ed SHA-1: b33c4074bee04db25c0ad9ad0bffa01f9f14ad37 SHA-256: a448d368cf377d18816b809fbe7b246578aa79f15fe596ad96bfcf9f36134b9d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

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
  • 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://botokaw.ru/strik?utm_term=creepy+nights+at+freddy%2527s+2+android+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469617/normal_60053c58e61d4.pdfIn PDF document text
    • http://masarutaboranar.iblogger.org/mackinac_bridge_weather_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_5fe9082e91e34.pdfIn PDF document text
    • http://memoxilebuse.22web.org/51991240300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_604a4c6c20a8b.pdfIn PDF document text
    • http://retoxebed.22web.org/the_unwanteds_book_2_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_603371ab1e5d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426967/normal_604f10e86cb9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381081/normal_5fcf23309f493.pdfIn PDF document text
    • http://dixurujisefumet.22web.org/8767190364.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_5fc9cfa36ebbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_604919e61d489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5fde6baa3e5d2.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/b9259456-6017-4c76-91fc-d5e4d15e2b93/how_to_play_rhythm.pdfIn PDF document text
    • http://japotegalavig.epizy.com/android_background_app_refresh.pdfIn PDF document text
    • http://serinuzosazojup.epizy.com/what_is_modern_management_approach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea1f9b9-1b11-4446-927d-b0d294668171/42586383003.pdfIn PDF document text
    • http://bovinow.epizy.com/mavivax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b2434d7-5b87-4c7a-af12-fcdf8c599106/innova_multimeter_3320a.pdfIn PDF document text
    • http://netixoxolasabo.rf.gd/eton_scorpion_crank_solar_radio.pdfIn PDF document text
    • http://lemizirimafon.epizy.com/metformina_500_para_adelgazar.pdfIn PDF document text
    • http://gefureguk.epizy.com/kizajezutozubivaz.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_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 5508 bytes
SHA-256: e51e5fe0fa8c907a7634010c489faa937f6e8fdfe1e70a1c397092b1a55b7063
font_01_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 16496 bytes
SHA-256: c4f23458e51128ceda19b544d97e694ca2d21eaa34bd9ed368bd4bb3881b973f

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