Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b882e6e496e60d9…

MALICIOUS

PDF

81.5 KB Created: 2021-03-17 08:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 716e0ef21a55c4bace4d67fd3eecd3a6 SHA-1: da94ac75a1ebdb6f78cb19b1dbc6342d505d221e SHA-256: 6b882e6e496e60d9f16b96b754f8428cb81716553c1dac3628f91b82faa6eb82
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a link farm on disposable hosting, designed to redirect users to external URLs. The primary URL identified, https://fokemale.ru/123?utm_term=balance+sheet+practice+problems, is likely part of a phishing or scam campaign. While no scripts were explicitly extracted, the PDF structure and external link suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://fokemale.ru/123?utm_term=balance+sheet+practice+problems PDF link annotation
    • http://molipetofokeva.22web.org/aplanadora_de_tierra_manual_mercadolibre.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/how_to_use_a_planner_with_adhd.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/50756141241.pdfIn PDF document text
    • https://napuximijagebi.weebly.com/uploads/1/3/4/7/134766840/pibazi_damoleros_kuwitazagilejum.pdfIn PDF document text
    • http://komakukamuduwi.iblogger.org/baixar_os_axiomas_de_zurique.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/xeziwiwibojizuxipafujelum.pdfIn PDF document text
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/8287315.pdfIn PDF document text
    • https://mesopivupezuna.weebly.com/uploads/1/3/5/3/135311967/joxizebaluxa_lozid_nivibototiwit_retis.pdfIn PDF document text
    • https://fadasizoguwo.weebly.com/uploads/1/3/6/0/136050507/8e55094.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/c002c.pdfIn PDF document text
    • http://topekabur.iblogger.org/neurocritical_care_status_epilepticus_guidelines.pdfIn PDF document text
    • http://dirozigumifew.scienceontheweb.net/meviporunafowamubuno.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/litunux/chaco_canyon_visitor_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0211ea9e-27f5-4393-9e75-d6c5a6c40cf9/zerilaga.pdfIn PDF document text
    • http://bipaxoxibiva.rf.gd/ledapolofuzaji.pdfIn PDF document text
    • http://dikuwipesunebo.rf.gd/15112853178.pdfIn PDF document text
    • http://nanefelizili.epizy.com/zenevabiduzijokobufuzodow.pdfIn PDF document text
    • http://rabelinowizufe.myartsonline.com/hindu_baby_boy_names_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf7debd-e0d0-42a0-ac00-feb17ceeccaa/fapimofanisuwarilonafaled.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/jozipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7cd4065-7aa0-4fb9-becc-b37d6a225b1c/make_the_big_time_where_you_are_book.pdfIn PDF document text
    • http://bizujexexo.epizy.com/7287725904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba713b6-59a7-4fb7-b32d-46fab61eb1fc/11753001271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac0748b-dea4-47b7-bb4a-4429aa46cd6f/pijugetawo.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/brush_texture_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/bossa_nova_drum_beat_sheet.pdfIn PDF document text
    • http://xekugunefutum.epizy.com/f_table_statistics_.01.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_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 5360 bytes
SHA-256: f914d293c79fffcd15fafe96d5db24646d6b010d400ed9665ee61d38b4dd075e
font_01_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 11424 bytes
SHA-256: 56e5776f1c3628429ee471c0f32f02a297bcdf40ad05a0cf1c61a00ff91b547d