Malicious PDF — malware analysis report

Static analysis result for SHA-256 0342e795d636a8dd…

MALICIOUS

PDF

78.9 KB Created: 2021-03-22 10:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b9583a9585cec423c0b544b6a431038a SHA-1: ade131d16d6bb31377953220282b8a1876a38705 SHA-256: 0342e795d636a8dd6143dbfe5beaef4c9800425d1625839ef261da72b7b21f3b
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain metadata related to its creation, suggesting a lure to disguise the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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/wix?keyword=short+stories+with+figurative+language+middle+school In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450746/normal_5fee1b3224e8e.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/709064438169wk8y.pdfIn PDF document text
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/jofeseba_zowote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_60364f8c12f64.pdfIn PDF document text
    • http://hookup154.space/osha_regulations_for_tinted_safety_glassesepi3b.pdfIn PDF document text
    • http://shopwithsale.website/wisekatupevejeme87czf.pdfIn PDF document text
    • http://retys.fun/how_to_treat_eczema_through_diet46n32.pdfIn PDF document text
    • http://farirawefufiz.iblogger.org/jay_z_the_black_album_free.pdfIn PDF document text
    • https://vuxemirisem.weebly.com/uploads/1/3/1/4/131453034/8f4d1d44cec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_6004a8cc608f5.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/timebumikitixunukozekolasp5tb7.pdfIn PDF document text
    • http://mexuloxuxinona.iblogger.org/android_browser_history_export.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c45f30-3bf7-4460-af0e-11ae6162cd83/model_averaging_logistic_regression.pdfIn PDF document text
    • http://malejuvi.epizy.com/fevevebuwonuwupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ca415e-b9db-4d57-940b-93e2df244b00/a_history_of_europe_in_the_modern_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035f57c3-b117-4a66-b692-0d5d9ea90d0a/walmart_grocery_promo_code_for_existing_customers_2021.pdfIn PDF document text
    • http://nazozogev.epizy.com/esl_business_english.pdfIn PDF document text
    • http://keluwuvofaj.epizy.com/kuxeluzozefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c911271-b06a-4ec8-bf68-66c8f8e9dae2/codigo_ascii_para_cerrar_signo_de_interrogacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e35288c-520b-4138-93bf-3b2ff3b16dc8/strength_training_and_cardio_weight_loss.pdfIn PDF document text
    • http://telimagafire.epizy.com/best_90_day_plan_for_new_job.pdfIn PDF document text
    • http://pulijivugis.epizy.com/49436398472.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_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 5692 bytes
SHA-256: 59b5de8a448c08c7f3c683d5e8d7fa738732aafdac5a74ae3e541ad94cabe149
font_01_sfnt_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 10916 bytes
SHA-256: e4689731adeaaa3d1ebb5e99e8403be54a96e3e1aae490f977ea37cc6a38868a

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