Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3dcf96809fdbbed…

MALICIOUS

PDF

78.4 KB Created: 2021-04-28 17:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 74728c4dbf8ff6dd3e230ac7345719a9 SHA-1: c4ba21f023b02b603d16ddc429598e11aa906fb4 SHA-256: d3dcf96809fdbbed098524681fc1bd17a0d5e169d18472f4de4751adcb8dfc4f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or unknown domains, suggesting a link farm or phishing lure. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://nipisod.ru/strik?utm_term=erik+erikson+8+stages+of+psychosocial+development+powerpoint PDF link annotation
    • https://cdn.sqhk.co/melobokodijo/bPghij8/touch_the_monkey_song_jungle_book.pdfIn PDF document text
    • https://xewurilarigifu.weebly.com/uploads/1/3/4/2/134236076/7944f17.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/dowipateruzedux-tenogexofobu.pdfIn PDF document text
    • http://lagujegivupani.22web.org/free_pictures_of_flowers_to.pdfIn PDF document text
    • https://vumiluvitut.weebly.com/uploads/1/3/2/6/132696113/c548ad22b4e61.pdfIn PDF document text
    • http://wanuzib.22web.org/booky_wook.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/gVcgiid/free_tv_apps_for_iphone_7.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/KjcgieF/swamp_attack_hack_mod_apk.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/massachusetts_learners_permit_restrictions.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/94944668190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dodarululi.epizy.com/accounting_equation_example_balance_sheet.pdfIn PDF document text
    • http://gagelenobom.epizy.com/ipcc_report_2014_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/sensory_integration_and_praxis_tests_sipt.pdfIn PDF document text
    • http://wawefib.rf.gd/23413575320.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/how_do_i_report_reckless_driving_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/luzibopimokisij.pdfIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_eaa11b059f954ae89c764c82ec820e76.pdf?index=trueIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_739292607a3343bd88feb72c824bdd53.pdf?index=trueIn PDF document text
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_4859dddc727f418396264155defe8b92.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_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 6040 bytes
SHA-256: bb9a60c597155034cdf911ab1126c0a84b90998bda7ae0480f30b1ad4181f278
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 10788 bytes
SHA-256: f7a1ce9e2e9a4e7636129b2267b6205d422e8b4590238d636d514331ad90a2ee

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