Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45a0ca61a84d76c…

MALICIOUS

PDF

71.2 KB Created: 2021-06-05 10:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 276d3d33fd59fc79b5040689a6f3d6cf SHA-1: 10032ca88bc5aeab5333b53799c86c2c6fba088a SHA-256: e45a0ca61a84d76c13e03b888e93abc97bc92c3afc3e2fadfcacf697b3f9d3b2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/pbw?utm_term=zombie+sniper+shooter+3d+mod+apk PDF link annotation
    • https://dasifapuzo.weebly.com/uploads/1/3/1/4/131454731/af8ca1c269af7.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/5e66bad71e095c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461207/normal_60093145861d4.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/5925619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_6032b9c21e0a9.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/niragunimajabomut.pdfIn PDF document text
    • https://nibuzexo.weebly.com/uploads/1/3/4/7/134720699/656459.pdfIn PDF document text
    • https://xegilebul.weebly.com/uploads/1/3/4/3/134347284/jogegus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipibujewadu.pbworks.com/f/60358860313.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/what_are_the_primary_responsibilities_of_a_financial_manager.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144509412/manakata.pdfIn PDF document text
    • http://mujusevo.pbworks.com/f/how_to_apply_for_economically_weaker_section.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/libro_numerologia_tantrica_gratis.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/f/download_mp3_maher_zain_number_one_for_me_full_album.pdfIn PDF document text
    • http://nukuxim.pbworks.com/f/how_to_install_a_wayne_dalton_torquemaster.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/how_many_types_of_assets_are_there.pdfIn PDF document text
    • http://pidexuxok.pbworks.com/f/is_barrons_sat_good.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/w/file/fetch/144510882/25882547480.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/w/file/fetch/144607560/lecturas_breves_de_comprension_lectora_para_secundaria.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_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 5492 bytes
SHA-256: c232e61107d0bef2a2a3056a58655b322a6974a45324b599e365d23fa7500655
font_01_sfnt_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 11216 bytes
SHA-256: 158a2f414a6ee920b58e5dc6ee37d065c1be50c414aa9e637b5446b7078ee3c0

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