Malicious PDF — malware analysis report

Static analysis result for SHA-256 55532d21eda2376c…

MALICIOUS

PDF

108.9 KB Created: 2021-03-23 05:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5c3cd2cc6da6c28aec049e5cd3f2e2af SHA-1: f279fb7dd2ddb56e97d18e0319b0031dfab922d9 SHA-256: 55532d21eda2376c90a8fde28059a173a71ef8e9bfc752adcab287bbb56310c3
134 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to 'self esteem exercises for youth' which is likely a pretext to encourage clicking on malicious links. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/strik?utm_term=self+esteem+exercises+for+youth PDF link annotation
    • http://apparentlyopt.com/audible_audiobooks_podcasts_audio_storieshysus.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/9928538121.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/linkedin_profile_template.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/the_expanse_season_4_episode_10_wiki.pdfIn PDF document text
    • http://nunejabu.scienceontheweb.net/agenesia_parcial_del_cuerpo_calloso.pdfIn PDF document text
    • http://moitender.org/29224137668r0a41.pdfIn PDF document text
    • http://hot-money.fun/galaxy_attack_thunder_shooter_2022_mod_apkr9zkc.pdfIn PDF document text
    • http://exemplpusj.com/merutifenemuvav5378x.pdfIn PDF document text
    • http://kungfumalibu.com/what_is_the_best_bible_version_for_youth9proj.pdfIn PDF document text
    • http://pirojibanenuzi.getenjoyment.net/8217669922.pdfIn PDF document text
    • http://energierecrute-emplois.com/what_type_of_oil_for_2014_toyota_siennafvs1f.pdfIn PDF document text
    • http://lopixerirerenex.mywebcommunity.org/hypertension_guidelines_2020_aha.pdfIn PDF document text
    • http://jobs-ingenieur.best/many_peoples_many_faiths_10th_edition1pj06.pdfIn PDF document text
    • http://immorta-cross1.club/bangla_islamic_dua_booke0ov1.pdfIn PDF document text
    • http://posurazatux.mypressonline.com/miller_and_levine_biology_chapter_20.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/machine_learning_algorithms_for_healthcare_data_analytics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/what_are_phonemic_awareness_strategies.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/88700180412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe6b011-d2c9-4ab4-b9f8-a5639509b490/blackweb_mouse_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/258d72e3-a05e-450d-873e-4e964e715843/sugixevegemetusiriragupe.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/whirlpool_ultimate_care_ii_washer_will_not_spin_or_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4811f6-23d6-4c77-957a-66f21c7517e1/12784745697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baa60b03-e4dd-4a7f-a579-36dd399e4e2d/57694556646.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/autocad_2018_2d_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/fozivizinex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e858df-6083-47a2-ae60-5757dd713276/vba_code_to_send_email_from_excel_to_outlook.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_off00016c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C55 5184 bytes
SHA-256: a2758ab15fa4a70acd418d93640edbc0bd38ce77ac55e5af80f0b011771f3c03
font_01_sfnt_off00017de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE0 12296 bytes
SHA-256: 9739504cdf6de051af587c0189db9807a563b2eb5e6314d44d7100d0fe4362cb