Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d88e600cb0f1d00…

MALICIOUS

PDF

80.3 KB Created: 2021-03-31 20:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b34ba6ae793c3f7dc098cef3110e5389 SHA-1: 79cc36eaffa5ed4176bfb8b3483e71eecb31ae95 SHA-256: 3d88e600cb0f1d001d5e6183034bf87c54151ea8aca54c3c12dc2bf274b61731
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated, but the presence of numerous external URIs and the overall heuristic firings strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/wix?keyword=eht+nature+reserve+fishing
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5ff12ff7d41e0.pdf
    • http://fegokodelaxen.scienceontheweb.net/broadcast_journalism.pdf
    • https://cdn-cms.f-static.net/uploads/4459791/normal_6058da4451ac9.pdf
    • http://alternativeinfluencenetwork.net/steroid_shot_for_shoulder_impingementprmpa.pdf
    • http://reduslimitalia-official.website/when_honda_rebel_300_launch_in_indiaoy95n.pdf
    • https://cdn-cms.f-static.net/uploads/4460447/normal_600c977df2046.pdf
    • http://leafester.online/2456268540t8nly.pdf
    • https://xagufiwukana.weebly.com/uploads/1/3/4/6/134694649/susunagezi_zasitopewojan_nenuturizotom_zonugavut.pdf
    • https://lumodafudewose.weebly.com/uploads/1/3/4/4/134480169/tutuwoguseb.pdf
    • https://tinabatof.weebly.com/uploads/1/3/0/7/130776088/8245610.pdf
    • http://tupujetu.sportsontheweb.net/importance_of_topographic_survey.pdf
    • https://fobanuvoba.weebly.com/uploads/1/3/1/6/131637247/dcaedc37b546f.pdf
    • https://zowomotoridaxa.weebly.com/uploads/1/3/1/4/131438570/zonogusexa.pdf
    • http://nigemutekilum.mypressonline.com/prioritization_delegation_and_assignment_3rd_edition.pdf
    • https://cdn-cms.f-static.net/uploads/4494432/normal_6015393b4b411.pdf
    • https://static.s123-cdn-static.com/uploads/4369514/normal_5fff93c51a42f.pdf
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/botero-watita-xajukid-revobowozo.pdf
    • https://nagajaburelu.weebly.com/uploads/1/3/2/7/132740350/9802453.pdf
    • https://rikomurisixub.weebly.com/uploads/1/3/1/4/131454733/kujut-wijevar.pdf
    • http://movawizaxaxato.mywebcommunity.org/mercruiser_service_manual_16.pdf
    • https://cdn-cms.f-static.net/uploads/4382618/normal_601566a980d57.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jowosos.myartsonline.com/schrodinger_wave_equation_download.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_off0000fbe3.bin
ec9a62a3b343c957b8a7789818fda310fdd4a46a658c83733328754d054e9bbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 5012 bytes
font_01_sfnt_off00010cf9.bin
40accc644162bb7abdecf75304b191224f84201c9d2762383b63754823c04b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 11496 bytes

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