Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb4001500691657…

MALICIOUS

PDF

77.2 KB Created: 2021-04-26 14:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 56d5d161dff78a084e983d2776f1020e SHA-1: 798b8e0f62890b0b50f972b7c4fb7b74b9cd46f7 SHA-256: 2fb4001500691657f2c2673a63d091e2f053f117f856281d0439d8fdf97a9be6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=why+is+nvivo+good PDF link annotation
    • https://jedadizonavo.weebly.com/uploads/1/3/4/7/134721040/7391642.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/have_noun_feel_adjective_exercises.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/jidake.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/ejercicios_numeros_romanos_3o_primaria.pdfIn PDF document text
    • https://samibogamo.weebly.com/uploads/1/3/4/8/134883552/lojibebubekijalomega.pdfIn PDF document text
    • https://niremavepuna.weebly.com/uploads/1/3/4/6/134625676/puvoriminufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/how_to_install_tp-link_tl-wn725n_without_cd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d141505c-f075-4ad4-ad15-1197bd1b3629/dyson_big_ball_animal_2_cylinder_vacuum_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfb21d2-21be-417c-9209-521497074180/xudapageguwoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a751cc-79c9-48cf-b7ea-eeb5d33b3b7b/presonus_16.4.2_price.pdfIn PDF document text
    • http://radulamuwufudez.epizy.com/school_supplies_in_spanish_worksheet.pdfIn PDF document text
    • http://zotubune.myartsonline.com/baxugowejarizexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f33eb5f-588d-4b6e-8205-409a90e72722/navien_tankless_water_heater_error_code_e515.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/chrome_stopped_supporting_flash.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/koluvugu.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/25984653795.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/guia_autometrica_septiembre_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/jemuzinenopujijoxuronanur.pdfIn PDF document text
    • http://kifavorufodib.rf.gd/bacon_and_butter_book.pdfIn PDF document text
    • http://zepedijuva.epizy.com/sepsis_sofa_score_guidelines.pdfIn PDF document text
    • http://febinobe.epizy.com/trumpet_music_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6755646-b636-4360-8e29-4a96a2557f77/how_to_apply_large_vinyl_window_decals.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_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 4924 bytes
SHA-256: 84da727540b11b18dfc6b747e19271e08891d353183adeade8ac9522d0310f7f
font_01_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 10512 bytes
SHA-256: 8a3e5d4791b4e201711058c58c8fd6d438ed1ba39dd5773877d304ecdc371129