Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b48ecd6920abdb…

MALICIOUS

PDF

82.7 KB Created: 2021-03-07 08:21:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 21a79c9263d435dfe15ebb70258770a4 SHA-1: d47a0277bb5f95f86ee9fac53f30193facfd76d8 SHA-256: 91b48ecd6920abdb035d81e08b042df9ccdd592b3cda575ca3ae63b8a1fe0500
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to phish or deliver malware. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=what+to+do+in+wow+before+shadowlands In PDF document text
    • http://molotkov.site/lowazavc79p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406216/normal_602c03959955b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_60010d5b8c29b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_603fe27e6aa2a.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/85263542837.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452398/normal_5ff932b791db0.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/tibewaguza.pdfIn PDF document text
    • http://rikafitamedad.medianewsonline.com/sawasabom.pdfIn PDF document text
    • https://wujuzuvetawi.weebly.com/uploads/1/3/1/3/131379059/1981860.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/icom_ic_7410_specs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458412/normal_5fed1ddc4eae0.pdfIn PDF document text
    • http://thelait.pro/diccionario_biblico_reina_valera_para_android47euo.pdfIn PDF document text
    • http://timelessdecorum.com/delonghi_aircon_fault_codesmfedc.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/gavexilatuvitaz/74112650967.pdfIn PDF document text
    • http://vuxebezedigelun.onlinewebshop.net/8272412672.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/handbook_valves_actuators.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/certificate_of_insurance_form_mc_65_m.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/lujiwedamigusibi.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/debowudu.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_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 5240 bytes
SHA-256: 0ca9fcac5d424c9b0d54c33e3e91be6ffb5542e2f6800d6a7d9d3526d51dc305
font_01_sfnt_off000116b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 11480 bytes
SHA-256: ad9f0e38ebf0d114d6b9ea885132b0aa702ab172eb4462ed168ba325d7a8459a

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