Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f73ba9cdff6bacb…

MALICIOUS

PDF

73.2 KB Created: 2021-03-27 16:19:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2b0e7383695f4bcb37eb97d54be7294d SHA-1: a08aaf8df641b35e0502ef66b085753e3b6f9249 SHA-256: 9f73ba9cdff6bacbd5b35518719e02a04f3ec12834e66f06b16ee84b381fcf3d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to 'Cartella clinica integrata pdf'. The presence of multiple disposable hosting links further supports a malicious intent to redirect users to potentially harmful content.

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://druttle.ru/award?keyword=cartella+clinica+integrata+pdf PDF link annotation
    • http://copyright-rules-help.com/negivibatadose1wuyj.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/494514375707cl65.pdfIn PDF document text
    • http://agencymedia-ig.com/mijofosimipzvccz.pdfIn PDF document text
    • http://premial.su/dilolamebolemagutvrwh.pdfIn PDF document text
    • http://sakepugikunon.mypressonline.com/catecismo_da_igreja_catolica_de_a_a_z.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/ebjejfX/salab.pdfIn PDF document text
    • http://strongcreditscore.info/how_to_set_temperature_on_a_norcold_refrigeratortvkia.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/gdihG7H/4535795615.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dizogabage.rf.gd/kujuwe.pdfIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_ba416884298f4106b92d2197ff2be5c1.pdf?index=trueIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_3de7f648aeef45c1b6e7d327432ea14a.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_b8943587f2674699928fadff6b637357.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_19c2d4d83df64721a299a674c4e5f3e3.pdf?index=trueIn PDF document text
    • http://vujadexofon.atwebpages.com/software_engineering.pdfIn PDF document text
    • http://tufebogepamik.rf.gd/akrama_sakrama_application_form.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_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 5048 bytes
SHA-256: e49a1e10e82a790d9dea7df677f85ae1b653611842635145aefe84dbb2deeed4
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 11652 bytes
SHA-256: 64c5998fe11323aea43178baa5b1f8eb09773933b14bd192c9d4c326f96f1195

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