Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc3a892bcfd7fc0…

MALICIOUS

PDF

77.0 KB Created: 2021-03-30 03:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0e5bf5ca2374376ba22c2ef30af2bd78 SHA-1: fc8561d7064b9c3d55276e3f47e0960e2e16958b SHA-256: 4cc3a892bcfd7fc00896182d9edd10a254c7f6c3ade81d2750265cb661e4e8ed
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, identified as a link farm, likely intended to manipulate search engine results or lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, with the primary function appearing to be the distribution of other malicious files via these links. No scripts were extracted, but the structure and external links are sufficient to classify this as a malicious distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://dugedepap.ru/award?keyword=arduino+uno+programacion+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416151/normal_5ff97760c2b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391303/normal_604faeb700dc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_601a9be99273b.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/arabic_to_urdu_dictionary_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fd66349ac366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_60184aeedb0c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_5fcc8227b8c65.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/clinical_cases_in_anesthesia_4th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_604a15fddfed5.pdfIn PDF document text
    • https://cdn.sqhk.co/papowepu/hD8ihgg/78109638290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_60497a0dc78bc.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/fjcnggj/zelumisaku.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/cPjigiO/fixewaxaxesumemum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405440/normal_5fe0c069ce2e9.pdfIn PDF document text
    • https://cdn.sqhk.co/zodenizekija/zjgiXxg/weather_channel_app_for_iphone_help.pdfIn PDF document text
    • http://resapus.scienceontheweb.net/32722946768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_c57dd5d5dbc545a694cd1e72e75634e5.pdf?index=trueIn PDF document text
    • http://gitodake.myartsonline.com/agile_software_development_alistair_cockburn.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_ac151c019f6e47e1acf58420bdf1dff7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/878705e0-5626-47cb-951b-ff92d6eed60e/dofoxuxexi.pdfIn PDF document text
    • http://wipibefab.onlinewebshop.net/xadikimoxebemot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a467459-526e-4ab0-a84c-48aeeb2136c4/zawuwofopuvadegaz.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_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 5256 bytes
SHA-256: 4e57188813a1c69362b5fa9e7cda92a54f04f8481f1610c788280cfc89b31ccc
font_01_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 11724 bytes
SHA-256: 2348f4555000fd7259c91cc633a3818736cb195a34f35cd582a1993994611467