Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ccda24c59d92ef…

MALICIOUS

PDF

74.7 KB Created: 2021-06-12 05:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e9cd1cd227c34a03a1b0d39c75e594fb SHA-1: 19e8d559ddd66f3ba274f5bb3420dd857b4c134b SHA-256: a5ccda24c59d92efc254c39c64a6c4494fbefb174b0046c932ff3b12654e6f98
186 Risk Score

Malware Insights

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

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 0.9995

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://inwebjor.ru/pbw?utm_term=oh+my+darling+clementine+piano+sheet+music PDF link annotation
    • https://segovukejogudu.weebly.com/uploads/1/3/7/5/137514481/7202262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_601d8bf6a33f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490370/normal_5fda174eab929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_60c2e91052f57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_6039eb60c21dc.pdfIn PDF document text
    • https://kazusabetife.weebly.com/uploads/1/3/5/3/135318045/xepidum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383128/normal_5ff52b4fc3cca.pdfIn PDF document text
    • https://kesizibewasi.weebly.com/uploads/1/3/0/8/130813921/vodarasagamati.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/mopijafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412758/normal_5ff40f58cb862.pdfIn PDF document text
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/72d00ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474457/normal_600fbffd1014b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosixuze.pbworks.com/w/file/fetch/145115157/aimbot_cs_1.6_chomikuj.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/f/tarjeta_zea_de_cumpleaos_amigo.pdfIn PDF document text
    • http://nefusim.pbworks.com/f/radhe_radhe_flute_ringtone.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/timotunujeliwolodunisuxe.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/w/file/fetch/144579804/xbox_360_emulator_android_games.pdfIn PDF document text
    • http://ropotupi.pbworks.com/w/file/fetch/144709326/como_crear_cuentas_netflix_premium_gratis_2020.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/145151751/noduzebukamoweni.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/w/file/fetch/144591750/3808235744.pdfIn PDF document text
    • http://xujefix.pbworks.com/f/guzuderasipikud.pdfIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144412836/how_to_find_a_missing_angle_in_an_irregular_polygon.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_off0000e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 5616 bytes
SHA-256: 5101a6c3f7dca2774aa28e1934294a3d1c33ae954c31dfc65e40ee3092bfaac6
font_01_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 10444 bytes
SHA-256: cb21b5222d69327b41d99a650e16fdec7b002666a2515fa506d83c07f1868164