Malicious PDF — malware analysis report

Static analysis result for SHA-256 f401a20a126fefe6…

MALICIOUS

PDF

74.6 KB Created: 2021-03-16 17:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1ee31e3e7e7ebba8e76e63db8f430ddd SHA-1: 89047e311837ccd31e5cc200ccdad24e4becb6b2 SHA-256: f401a20a126fefe6fb7fd9949add6a717a3bc3769932d33efa3ad596810f56bf
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, with a primary external URI pointing to 'mezovuduw.ru'. Heuristics indicate this PDF is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=real+life+problems+involving+parallelogram PDF link annotation
    • https://nidukonijeso.weebly.com/uploads/1/3/1/3/131381088/nudesawow-nirexerezubexad-xapetoli.pdfIn PDF document text
    • http://botefin.medianewsonline.com/27656512059.pdfIn PDF document text
    • https://rinuvimasajef.weebly.com/uploads/1/3/2/6/132695862/9092878.pdfIn PDF document text
    • http://rapedazev.22web.org/como_baixar_livros_gratis_em.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/60470440413.pdfIn PDF document text
    • http://avlto.best/best_pressure_washer_surface_cleaner_for_deckso0m4a.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/what_is_a_warranty_deed_used_for.pdfIn PDF document text
    • http://magabof.22web.org/bosnia_and_herzegovina_constitution.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/lic_jeevan_akshay_form.pdfIn PDF document text
    • https://puxodemidumez.weebly.com/uploads/1/3/5/3/135345879/divizumabaxew-jofif-voroxakado.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/01cd78a0-e255-4535-ab76-eecf0d6ef491/mazda_cx_7_luxury_2007_reviews.pdfIn PDF document text
    • http://vafosune.rf.gd/6565940269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c47febef-972c-434e-9d5e-5602b7158761/historia_natural_dela_enfermedad_dengue.pdfIn PDF document text
    • http://forojiwimudobo.atwebpages.com/1952_play_by_samuel_beckett.pdfIn PDF document text
    • http://jumebesatupa.epizy.com/suwabanasixididabomesede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/869c6969-5702-4082-a887-7757257514b0/what_is_factor_rating_method.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 5428 bytes
SHA-256: dd5e9d8172037e473c56d263d332186e0089db5deaa4c608beecc64f074f7fb8
font_01_sfnt_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 10940 bytes
SHA-256: abc03c968c44a9b6e30af2dbed76d3f1d05cfe8fd2926ddaa51f01f6c73a44b9
font_02_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 16072 bytes
SHA-256: 4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd

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