Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3715101ae64f04…

MALICIOUS

PDF

77.0 KB Created: 2021-03-29 09:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a033677662696babeb482b17d208ea5c SHA-1: b49c2fd37aed93205dbdfbfc47fb70cec149e3e6 SHA-256: 3e3715101ae64f04b2934137455d1fa593f97fda1289763692c10d3f7f02fdf6
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that redirect to suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to a malicious site for further exploitation. The document body, though heavily obfuscated, contains text related to pool systems, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/strik?utm_term=how+to+check+salt+level+on+hayward+aqua+plus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378848/normal_60314aaa47529.pdfIn PDF document text
    • http://idclick.cash/all_my_sons_moving_careerso3bkq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490138/normal_5ffb7cbddfc0f.pdfIn PDF document text
    • http://reduslimitaly-official.site/laboratory_manual_for_general_organic_and_biological_chemistry_2nd_editionct8bk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378857/normal_5fdfaa6daa317.pdfIn PDF document text
    • http://1s.london/90651473166misj0.pdfIn PDF document text
    • https://cdn.sqhk.co/zatufora/chioVgc/tipos_de_biocombustiveis.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/djghh81/smash_hook_city_wrecked.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/ipjhcic/microsoft_flight_simulator_fighter_jet.pdfIn PDF document text
    • http://avbox.org/jd_salinger_bananafishcen1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453721/normal_604937b48d349.pdfIn PDF document text
    • http://trikolor.site/lapowevetisujefevomqm8j4.pdfIn PDF document text
    • http://kuxni.su/la_magia_del_orden_libro_precio_perumhkq8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382784/normal_5ff25ed54469a.pdfIn PDF document text
    • http://eagleaff.com/forgotten_realms_timeline_1479e0epl.pdfIn PDF document text
    • http://banki-internetowe.com/ldg_it-100_tuner_for_sale90lxj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keximatefabuzi.rf.gd/mandatory_reporting_guide.pdfIn PDF document text
    • http://bededojobafepeb.rf.gd/40702228209.pdfIn PDF document text
    • http://posojorodinu.epizy.com/equilibrio_quimico.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/63140648531.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/autocrat_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/mufonedezapenufopuvifar.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/niveles_de_ferritina_y_covid_19.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_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 5564 bytes
SHA-256: 2ed9bfefbba3c2dcf0b09b34ac274fe94854c0cf3e8c138b3f1e6d1a82f538c3
font_01_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 10556 bytes
SHA-256: 618cf64d90d242872da5ecffa0625d5ef99c34188e49560ddbb5641be4fa5a53

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