Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8650499a944263d…

MALICIOUS

PDF

82.4 KB Created: 2021-04-02 11:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6660d3530bc905651d90aaa4d476d75 SHA-1: be548c15f91d3c2a1e2a6c1f3d7be89aae95cfe0 SHA-256: c8650499a944263d43f363e73b05dbe2af96acdad6441306b2cb44b6f60ae334
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection infrastructure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate an attempt to direct users to malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=how+to+open+lg+true+balance+washer
    • https://xowebanum.weebly.com/uploads/1/3/1/4/131453595/2308832.pdf
    • http://junosidax.22web.org/81226580012.pdf
    • https://cdn-cms.f-static.net/uploads/4483072/normal_6037ba41c8acb.pdf
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/muwejifudelibasowofo.pdf
    • http://pesuloduf.medianewsonline.com/apprendre_l_anglais_mdical.pdf
    • https://gagoduxo.weebly.com/uploads/1/3/1/4/131452981/91ae422f.pdf
    • https://cdn-cms.f-static.net/uploads/4370266/normal_6058896add942.pdf
    • http://zegererevez.medianewsonline.com/how_to_work_a_dab_radio.pdf
    • http://sunufosabupes.scienceontheweb.net/25351571861.pdf
    • https://static.s123-cdn-static.com/uploads/4385876/normal_5fedb9665c70b.pdf
    • https://static.s123-cdn-static.com/uploads/4475995/normal_5ff548a031718.pdf
    • http://lnstagram-verifedbadge.com/57200163126megoh.pdf
    • https://static.s123-cdn-static.com/uploads/4499651/normal_5fcd965132229.pdf
    • http://idealica-co.site/is_starbucks_skinny_vanilla_latte_sugar_freepinjn.pdf
    • https://cdn-cms.f-static.net/uploads/4368249/normal_605ff1a891dcf.pdf
    • https://static.s123-cdn-static.com/uploads/4420459/normal_5fc75dd263972.pdf
    • https://static.s123-cdn-static.com/uploads/4446275/normal_5fc9e691586de.pdf
    • http://gavolav.mywebcommunity.org/counseling_theories_chart.pdf
    • http://zesamoa.online/vizanidaxegimwjr2.pdf
    • http://pumuwofonukel.22web.org/cinema_4d_tutorial_download.pdf
    • http://scoretdho.best/most_popular_german_girl_names_1998a8zbq.pdf
    • http://omynutural.space/cardiovascular_disease_symptoms4j3x8.pdf
    • https://mofibowego.weebly.com/uploads/1/3/1/4/131406437/gatajibonibaboraz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://towawemigegi.epizy.com/angor_et_infarctus_du_myocarde.pdf
    • http://kukipugewogedid.rf.gd/mosunakeji.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_off00010189.bin
585c6a226d883aaf601472af425a3414af4efeeeb678830c1cd658cd49027e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 5388 bytes
font_01_sfnt_off000113e3.bin
b1c0bfe635eda43e1f4de44f575e1aa5a30b1d0a6988b02f40575522fe9b38b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 11696 bytes

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