Malicious PDF — malware analysis report

Static analysis result for SHA-256 981e8261a0d58d2a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-28 14:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9f2d1bde037940826b8430973d7373bd SHA-1: e9dcde0fe1c0c0ed596c5bbd7a2d484e0f04e72c SHA-256: 981e8261a0d58d2aad1c815cd305b64824f7d12aada5a339598ec8bc45350518
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to potentially harmful content.

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
  • 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://bologen.ru/award?keyword=website+development+project+proposal+pdf PDF link annotation
    • http://knitfqph.site/619539473372hwlp.pdfIn PDF document text
    • http://reduslimitaly-official.site/pumovusidalibeduga1joj0.pdfIn PDF document text
    • http://bibivaxowos.iblogger.org/capas_que_componen_la_atmosfera.pdfIn PDF document text
    • http://lejidakoxinetog.mywebcommunity.org/kudamisuveb.pdfIn PDF document text
    • http://bimovixexena.scienceontheweb.net/chemistry_textbook_for_secondary_school.pdfIn PDF document text
    • http://899themes-demo.ru/haggerston_castle_entertainment_guide_2018lapsg.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/98604999782.pdfIn PDF document text
    • http://jidapuxedepu.medianewsonline.com/enlace_n_glucosidico.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/jojelopel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumofif.rf.gd/skywalker_15-ft._square_trampoline_and_enclosure_combo.pdfIn PDF document text
    • http://kileduf.epizy.com/65843382415.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_f0b85b57ca1e4bcea48a10654af1b131.pdf?index=trueIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_cbe999c09e0a4bf499af6d14bf6c81be.pdf?index=trueIn PDF document text
    • http://liraperuwuw.atwebpages.com/98639119173.pdfIn PDF document text
    • http://dofomexikokubeb.epizy.com/christmas_sax_quartet_sheet_music_free.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_89ec9b19d15a4ba78077d5ca2d5def7f.pdf?index=trueIn 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_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 5592 bytes
SHA-256: 7d9046a9d2177f89d680583e46c2ad67091e75517f76118d24102743026ff1ca
font_01_sfnt_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 11128 bytes
SHA-256: c0381fe5538380abf8c5cabda3fd921863c5b242869691a5061db7ce08c07c13

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