Malicious PDF — malware analysis report

Static analysis result for SHA-256 192d39686c7b1262…

MALICIOUS

PDF

77.5 KB Created: 2021-02-14 12:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c2c1395f13f8e7eb48fdbd3297d66344 SHA-1: a41683278658a6fe03112e223e026fd496c27e67 SHA-256: 192d39686c7b1262639ffccacb8fafdd7cf66a96c300cfc9faae832787517d68
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/aws?utm_term=cardiff+sixth+form+college+school+fees PDF link annotation
    • http://b4shop.icu/zinuvizekodekofartxs37.pdfIn PDF document text
    • https://xutezanepone.weebly.com/uploads/1/3/3/9/133999331/3423975.pdfIn PDF document text
    • http://naturfresh.space/26630225292mngwu.pdfIn PDF document text
    • http://losmopaka.site/89076178085l59t.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/robubaf.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/a34c8f33af41.pdfIn PDF document text
    • http://copyrightprivacy.site/dovopisewagepuvemuzux7l6n2.pdfIn PDF document text
    • http://itclick.info/powerpoint_presentation_templates_nature1aelw.pdfIn PDF document text
    • https://wavixozuxukoreg.weebly.com/uploads/1/3/1/3/131380445/1156a861a1.pdfIn PDF document text
    • http://mantenancie.com/88037205371txg2g.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/valkyrie_profile_android_apk_modtdntn.pdfIn PDF document text
    • http://expressday.online/anatomy_of_monocot_stemt46rq.pdfIn PDF document text
    • http://save50.pro/lezibixitadiwerowogo2eymq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jukikusikodopom.epizy.com/hyperlipidemia_guidelines_singapore.pdfIn PDF document text
    • http://vopapatadape.epizy.com/offline_action_games_free_for_android.pdfIn PDF document text
    • http://jegovogetaferop.epizy.com/corrugated_plastic_sheet_clear.pdfIn PDF document text
    • http://kotujed.epizy.com/a_b_s_t_ka_full_form.pdfIn PDF document text
    • http://modunatotuw.epizy.com/google_chrome_for_pc_free_cnet.pdfIn PDF document text
    • http://ganuxujerotapu.epizy.com/free_guided_meditation_apps.pdfIn PDF document text
    • http://baruluzibovog.epizy.com/devastating_flood_in_kerala_report.pdfIn PDF document text
    • http://pepajefosub.epizy.com/zisages.pdfIn PDF document text
    • http://kekunulu.epizy.com/endocarditis_esc_guidelines_2018.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_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 5408 bytes
SHA-256: 24bf032c504ebac2359974b13ec79a07ea5c5d7ac9f893e2c0ab0c96346d24c9
font_01_sfnt_off00010400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 10588 bytes
SHA-256: 1c1b5f96b232b6bbca5c6e1e2c137383b25eb5d4b92eb7c0d7c87d95cff586a7

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