Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed083495a8f11d43…

MALICIOUS

PDF

80.2 KB Created: 2021-02-10 00:56:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 98a825f8032038d3496e68c96ae022bc SHA-1: ae2515f3ba9fed794ddd3e896bcbb73dccd7adff SHA-256: ed083495a8f11d434448db39449a0519099c12146b8893ddf66434d59152f219
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://crophysi.ru/123?utm_term=summon+monster+3+3.5`. This indicates the document's primary purpose is to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and redirection attack pattern. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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
  • 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://crophysi.ru/123?utm_term=summon+monster+3+3.5 In PDF document text
    • http://easterthjg.com/metabolismo_del_calcio_fosforo_y_magnesiorcq4u.pdfIn PDF document text
    • http://betmoy54.com/pisofeve8emdz.pdfIn PDF document text
    • http://smartcreditscore.info/aircraft_performance_and_designb8rqi.pdfIn PDF document text
    • http://businessmentality.com/main_tera_hero_songs_free_download_pagalworld.comj320m.pdfIn PDF document text
    • http://devlp.design/15376457640wuk5.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/penagedopebi-jemovosepajizuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/76640082308.pdfIn PDF document text
    • http://mevalegija.rf.gd/nezilakarofetanadomuxupi.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/accounts_receivable_ageing_report_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/mesowuvomimunazagodusataw.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/decline_of_bahmani_kingdom.pdfIn PDF document text
    • http://matezule.rf.gd/sepsis_coding_guidelines_2018.pdfIn PDF document text
    • http://guxudapese.epizy.com/harvest_moon_a_new_beginning_character_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/jewitogigivijunegalox.pdfIn PDF document text
    • http://puvusevakap.epizy.com/data_mining_tutorial_point.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_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 5012 bytes
SHA-256: 9df1b4e0674639992270522c224ed95f1997fdef45b0b71472f6b43bb05cbe2f
font_01_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 10832 bytes
SHA-256: 2a99fce9889ed3f0184ec279c1a5cf97108208d45ae96f8949a0a758324e014a

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