Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a24274d91f7c83…

MALICIOUS

PDF

66.0 KB Created: 2021-03-22 19:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e522b5c1c7252e6283f8e26257412835 SHA-1: 22b2c80cc7793efe464529eb3939436a9cf9c119 SHA-256: a7a24274d91f7c835c38e5f47d92a26b976c0779e9c40c7103148614014ed76b
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting or known redirectors, indicating a phishing or scam attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to redirect users to malicious sites for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=bsc+method+notes+chapter+1+pdf In PDF document text
    • http://widonatozeg.mypressonline.com/converter_para_musicxml_online.pdfIn PDF document text
    • http://sufawevugut.mywebcommunity.org/2005_cadillac_cts_transmission_repair_cost.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/short_breathing_meditation_script.pdfIn PDF document text
    • http://biwadevebudorif.22web.org/what_is_hair_theory.pdfIn PDF document text
    • http://13millions.store/can_you_whitewash_stained_pine2j012.pdfIn PDF document text
    • https://sapefesoj.weebly.com/uploads/1/3/1/4/131453354/gazadisezamawuza.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/what_is_a_routing_number_for_international_wire_transfer7to84.pdfIn PDF document text
    • http://lagulatobir.iblogger.org/vopurofuzalulipitam.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/duvotuso.pdfIn PDF document text
    • http://ragananutirud.iblogger.org/wadetuka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixufedexakav.atwebpages.com/airport_vocabulary_flashcards.pdfIn PDF document text
    • http://todidetiped.onlinewebshop.net/4061095657.pdfIn PDF document text
    • http://wokarodefi.onlinewebshop.net/cephalosporins_slideshare.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/alcalinidad_alimentos.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_3a83633edcce45d090430f7636eee0d2.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_d7cf84daba554340926d2c56f3e5f333.pdf?index=trueIn PDF document text
    • http://fidepogomuvi.rf.gd/google_viber_free_call.pdfIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_582eb7464e624e5294f889fe84767962.pdf?index=trueIn PDF document text
    • http://josuxak.atwebpages.com/angiospermic_characters_of_gnetum.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_off0000c42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42E 5464 bytes
SHA-256: 2b5cd45efddf9a6295cc0b85593c06b340a5d71f1d4f6a4110f7ad06a8d57ad3
font_01_sfnt_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 10492 bytes
SHA-256: 86d3a866669a83e70fb044f679029e0a91d054138cb9f5c4ad30741430dd029b

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