Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba08e90eacd6b17…

MALICIOUS

PDF

77.3 KB Created: 2021-04-18 18:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fd1cadb24a04da01e664a658f669f99f SHA-1: 0037b8fb907affbffd3358c0cea74acbbb3c875d SHA-256: aba08e90eacd6b176ab2b5aadb8ab0dddd821acfda63d0400ca8debc39810437
184 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of numerous links and the heuristic firings suggest an attempt to direct users to harmful websites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=necromunda+underhive+wars+ps4+pre+order In PDF document text
    • http://copyright-help-center.com/acetilcisteina_xarope_ems_bula2cedc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_6056498eb5755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_606e857e7e529.pdfIn PDF document text
    • http://domensita.fun/23249156945di4ch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_602af1c10d9c3.pdfIn PDF document text
    • http://nozatisesufi.scienceontheweb.net/9440641621.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489717/normal_5fe062cbb3d6a.pdfIn PDF document text
    • http://idealica-italiaoficial.site/songs_like_on_my_own_les_miserables9opsk.pdfIn PDF document text
    • http://2gusevshop.space/22965590981nqib2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423452/normal_602e53a5649cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_6054938e537dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5ff2df8e89ba4.pdfIn PDF document text
    • http://1fps.ru/33446143150j5601.pdfIn PDF document text
    • http://jobware.pro/le_petit_prince_chapitre_14_analyserpk8y.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/78702936118.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/bronkitis_kronis_pada_anak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_603d0138f1175.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/astro_del_ciel_spartito_per_pianoforte.pdfIn PDF document text
    • http://uggi-ugg.com/homelite_textron_super_2_chainsaw_manual9oz9r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_6011e2a5b56b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jikelaxapexa.onlinewebshop.net/96_ford_ranger_ignition_problems.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/wesujeweziwaxevanar.pdfIn PDF document text
    • http://lapetagalelan.myartsonline.com/munojiwetevarezezofotanu.pdfIn PDF document text
    • http://rijonitapadon.myartsonline.com/principales_funciones_del_jefe_de_recursos_humanos.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_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 5488 bytes
SHA-256: 50236612a287fa67c46fe49212207bbe2b7f74e359cb49aef63bde27271fffde
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 12076 bytes
SHA-256: dcc5c2651bdc755abd56bea37ec65cb052870efdd9fdedfae0288677e40b2170