Malicious PDF — malware analysis report

Static analysis result for SHA-256 b874aafe6665c42c…

MALICIOUS

PDF

75.9 KB Created: 2021-05-15 14:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d71d52c42454534a0303d1ce282d4b08 SHA-1: 58fb82a8855fb3ff599d4d092ceccc1b17ea59c1 SHA-256: b874aafe6665c42c2660fa4b03a4661b1360909260fffeab37d8440e1f0bf176
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous embedded URLs, with one prominent URL pointing to 'vilenefex.ru' which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to unlocking a thermostat, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=how+to+unlock+a+locked+thermostat PDF link annotation
    • http://bigops.fun/how_to_find_the_magnitude_of_a_normal_forcehrgut.pdfIn PDF document text
    • http://telemprom.xyz/lurapukasulosunuzowe1xsk.pdfIn PDF document text
    • http://akfb.online/defending_jacob_cast_episode_1o7060.pdfIn PDF document text
    • http://raisinshq.pro/47505418193yxxxs.pdfIn PDF document text
    • http://retys.fun/how_to_check_transmission_fluid_jeep_grand_cherokee_2014jlh18.pdfIn PDF document text
    • http://nipijapogila.sportsontheweb.net/xokajerajoliwavejarotu.pdfIn PDF document text
    • http://kafofal.mygamesonline.org/sifupoxadufigafelukorilax.pdfIn PDF document text
    • http://criticcxck.space/google_form_multiple_choice_multiple_answerswsrgd.pdfIn PDF document text
    • http://autobuff.xyz/anova_estatisticag7lwd.pdfIn PDF document text
    • http://potenciy.xyz/875283179547pw6x.pdfIn PDF document text
    • http://fapseo.ru/troubleshoot_minn_kota_foot_pedal0wscl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sedozod.rf.gd/tekexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ac7c75-b719-4636-8e8b-d57049cb9a2a/neladejorozofola.pdfIn PDF document text
    • http://vavinarel.rf.gd/learning_spanish_language.pdfIn PDF document text
    • http://sexosur.epizy.com/82776895366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a249b2a-761d-4319-ba20-5a6d0592bb34/ponutuw.pdfIn PDF document text
    • http://firuwasuwubo.epizy.com/manual_de_procedimientos_de_almacn_de_una_empresa_comercial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6074d57e-c629-4755-9abd-0ac7680568ee/bafang_bbs02b_48v_750w_mid_drive.pdfIn PDF document text
    • http://zijedan.atwebpages.com/42063978985.pdfIn PDF document text
    • http://tikokowekujuw.epizy.com/gym_weight_lifting_routines.pdfIn PDF document text
    • http://luderaguzafa.epizy.com/19886474709.pdfIn PDF document text
    • http://bukezodebas.onlinewebshop.net/employee_absenteeism_in_brazil.pdfIn PDF document text
    • http://tasobigadegef.epizy.com/benenden_health_claim_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b59af4c-3d04-4c99-bb97-210fea3ffb90/67641450515.pdfIn PDF document text
    • http://pedirite.onlinewebshop.net/bekusefetufov.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_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 5296 bytes
SHA-256: 5bc10eecd09531901200516effb4eb8953e4dd73840dd12ba210e43ffb52c5ce
font_01_sfnt_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 10228 bytes
SHA-256: 98ef85c2a2eabccaa6f1b43821992d429a279dac933be07b1f0938c7fd2fc291

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