Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbc3a7cf92669b5…

MALICIOUS

PDF

79.7 KB Created: 2021-03-11 08:23:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e400e4388d296d9d408a4ede3e21d242 SHA-1: 2979f01c0cebdc27ea31f0d057f5d4193473d0f2 SHA-256: bdbc3a7cf92669b51cf87e94f962d0773c1dde86c1dd1dfedd655d05ab7088f1
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one pointing to a suspicious domain ('resalured.ru') and another to a PDF file on a disposable hosting domain ('rezanufeku.mygamesonline.org'). The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/wix?keyword=group+1+periodic+table+name
    • http://rezanufeku.mygamesonline.org/wegefegobawegozorilu.pdf
    • http://sixesijilolun.mywebcommunity.org/flavors_menu_dunkin_donuts_names_with_pictures.pdf
    • http://ravigimojamel.mypressonline.com/86339859894.pdf
    • http://nanamojuvimujo.medianewsonline.com/crypt_of_the_everflame_trove.pdf
    • http://uscreditinquiry.info/35076816390eu1fp.pdf
    • http://mowefopovog.mywebcommunity.org/life_of_galileo_play_sparknotes.pdf
    • http://xelipev.22web.org/filazekelovidunevaze.pdf
    • http://vigastlens.xyz/pufenuradakigesodiputotuglolbm.pdf
    • http://alania365.ru/apsc_exam_2018_answer_keyerd9i.pdf
    • http://babusokojanog.sportsontheweb.net/90601905971.pdf
    • http://premium-cinema.com/987392562684nfxp.pdf
    • http://tulomodev.getenjoyment.net/67876339117.pdf
    • http://pejelurim.getenjoyment.net/what_marvel_movies_are_on_netflix_usa.pdf
    • http://kanaxade.mygamesonline.org/what_is_the_safe_temperature_for_food.pdf
    • http://joxitur.22web.org/40073027591.pdf
    • http://powajaxib.medianewsonline.com/xogapewiwaparej.pdf
    • http://lozejebivo.scienceontheweb.net/81874063043.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_3f39dfa7494b4511b3f88e7177853d56.pdf?index=true
    • http://tiwatimab.atwebpages.com/monivolepizadelalogozibo.pdf
    • http://mozaninukokefef.onlinewebshop.net/how_to_calculate_van_der_waals_radius.pdf
    • http://poruzimikipazan.epizy.com/wumujezivokerulimejezada.pdf
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_a7bffbbae79c4a34babaf8ea59aa43ba.pdf?index=true
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_c35ddcad5f684da8bc3c8dbad0bfd1b4.pdf?index=true
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_6f6d1dd2a4db470faf684de1af5d3891.pdf?index=true
    • http://sawesupunozigiv.atwebpages.com/best_pharmacology_book_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb49.bin
ca27791ab46a8f6130f9154f34b0b1156730873be39620555654e4548c731f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 5264 bytes
font_01_sfnt_off00010d1a.bin
a44f8dc712ebd5842d21421d84c180be19b97c0014a773eea6be6ca4fdb554be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 10508 bytes

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