Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8e12c4ccb4aa05…

MALICIOUS

PDF

70.7 KB Created: 2021-03-14 18:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 54b81b993ebab38d0270b03116c95d25 SHA-1: bacffcbaa910be9c07dc491ba142d61be2f6db6f SHA-256: eb8e12c4ccb4aa059395022b986e6796144fe9871871280d8f75681fdafb3a7b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a significant number pointing to disposable hosting and potentially acting as a link farm. The PDF structure and embedded URLs suggest it is designed to redirect users to malicious websites, likely for phishing or to download further payloads.

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://kuzutuzo.ru/wix?keyword=analyzing+pedigrees+worksheet PDF link annotation
    • http://xruhdfo.site/capitalismo_e_socialismo_resumotl8xc.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/2hfhfzx/wabamikefivefidaduzaj.pdfIn PDF document text
    • http://sugalomiwuto.getenjoyment.net/66122488019.pdfIn PDF document text
    • https://cdn.sqhk.co/wedowetaso/ghfhfVq/turbo_price_in_pakistan.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/how_to_save_app_to_memory_card.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/what_food_pairs_with_rioja.pdfIn PDF document text
    • http://spoonnumberone.xyz/black_ice_frostbear1hzy6.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/public_private_partnership_philippines.pdfIn PDF document text
    • http://cardioactiveufficiale.site/little_house_on_the_prairie_season_3_episode_20_castr8f4y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://womawujun.atwebpages.com/agisoft_photoscan_tutorial_espaol.pdfIn PDF document text
    • http://tulifal.onlinewebshop.net/21888670085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/660fcdd6-d3bb-484d-b7aa-30443c224d6f/why_does_my_xbox_360_shut_off_randomly.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/css_properties_and_values.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d51fe24-8069-4996-8195-c6143918dd37/how_to_trade_on_binance_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec5ebb1-dc1e-4d41-adcf-bcce5d5ededd/human_psychology_101_alan_g_fields.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1acc3dcc-d1a9-49bd-b8d1-a57f390df3cc/85761013122.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_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 5520 bytes
SHA-256: 2cfbe79d67518c96d6608ce8021fb3738ced8408f37dc1f28a2904c7969dd0ae
font_01_sfnt_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 10896 bytes
SHA-256: 38dfbac92c21e65adaec2b59511ed8d6fd1493eabfae91ffe1f902939b6155e5

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