Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d9558070173279…

MALICIOUS

PDF

82.7 KB Created: 2021-03-08 01:33:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5abdcc8c684f312f5ec84f93009631bb SHA-1: 442b92ca6d06a1aa8b05e7f0629b757f7cd2da81 SHA-256: 55d955807017327971ae87b02e68f9b585ba5d2ccdb87f26484216f1877ffd87
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('xezojetit.ru') that is likely part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to cloud computing security, aiming to trick users into visiting the malicious links.

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
  • 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://xezojetit.ru/strik?utm_term=what+are+the+security+challenges+in+cloud+computing PDF link annotation
    • http://giocodigital.website/87158473621dbn3x.pdfIn PDF document text
    • http://leqqurint.online/wakekixelenaloxuzutizuve9dj2i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530457/normal_60081cf92ff1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_6028ad46b64f5.pdfIn PDF document text
    • http://instacopyrightcenter.com/11810152544xfivk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482191/normal_5ffb7087f3bfd.pdfIn PDF document text
    • http://jirafka.space/nikita_gill_poemsljyyn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lemopuzawematex.rf.gd/peak_performance_capability.pdfIn PDF document text
    • http://feloxokarapuj.rf.gd/49367818036.pdfIn PDF document text
    • http://wobadumiravolu.atwebpages.com/25772126375.pdfIn PDF document text
    • http://disozisujenat.epizy.com/reliance_606_water_heater_thermocouple_part_number.pdfIn PDF document text
    • http://saliguk.rf.gd/integration_of_cos_x_minus_sin_x.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/83831417184.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/ncert_class_7_maths_textbook.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/22530641566.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/u_dictionary_apkpure.pdfIn PDF document text
    • http://gekomulo.rf.gd/penumbra_overture_ita.pdfIn PDF document text
    • http://tararefegegelel.rf.gd/pavafomu.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_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 5600 bytes
SHA-256: ce9fedca3bb7c3193816c257346973ad91a3910a4807050f12ebf795a5e8e2fb
font_01_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 12156 bytes
SHA-256: 9457b48d2f8fd97e460eaffeb0200e6000b530a40ec5b876dbba9cb75321aed8

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