Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4415f7cfae200b2…

MALICIOUS

PDF

75.4 KB Created: 2021-03-27 10:34:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e3be80e23f5260a08ebb65cf378cf74 SHA-1: 17a73bcb91f6baacfd63b8a5bf14b12953c31571 SHA-256: d4415f7cfae200b25980cd98c6ade97c3516f23f95f959b8ac9771fd8376fe93
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The embedded URLs likely lead to malicious content or phishing pages, and the document's structure points towards an attempt to manipulate search engine results or redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=tascam+dp-24sd+used
    • https://cdn.sqhk.co/tixunudixa/de2iiih/sleep_sounds_rainforest.pdf
    • https://josazosanika.weebly.com/uploads/1/3/4/3/134339908/3788742.pdf
    • https://doxuvufunufake.weebly.com/uploads/1/3/0/8/130874670/239ed7316df.pdf
    • http://zudalipa.22web.org/one_dimensional_wave_equation_derivation.pdf
    • https://dafavazama.weebly.com/uploads/1/3/4/8/134893815/minasusukizuta_likamesugi_kokoxipazo.pdf
    • http://menformula.xyz/13352591812rmcwd.pdf
    • http://hydraruzxpnew4af.exchange/5172935551ctaf4.pdf
    • http://itsamorem.com/filamifidilac5rk6.pdf
    • http://gratoram.site/xamidomatapobusavioajki.pdf
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/xokuwulora.pdf
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_20e6a8584718409c8acff9921aa476a9.pdf?index=true
    • http://jilabof.epizy.com/80153514209.pdf
    • http://mujevevurisul.epizy.com/teradata_timestamp_format_yyyymmddhhmmss.pdf
    • http://sesugemedolaf.rf.gd/define_memorandum_of_association.pdf
    • https://s3.amazonaws.com/dorulusof/frankie_valli_grease_sheet_music.pdf
    • https://s3.amazonaws.com/bubisifapagefe/landholding_policy_and_guidelines.pdf
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_3a77e149d3474d09827b9a7939deead8.pdf?index=true
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_751b2b5f01694b3598e3a7913e390f13.pdf?index=true
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_e77b009d263b4ff2b3f7a08c4ea3b5e9.pdf?index=true
    • https://s3.amazonaws.com/zerejibixupav/ejercicios_de_comprension_lectora_para_2_grado_de_primaria.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d1.bin
0c2fb4b8977b254e53b1dad3cc9e87907734b115d282336e1c2fcd89d568c95e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 5292 bytes
font_01_sfnt_off0000f8cc.bin
e0a55e72d6707ce51f8a1350920e64662893b044bb326497c6f910d6962dfd0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 11744 bytes

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