Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c15036c2dd92113…

MALICIOUS

PDF

75.4 KB Created: 2021-03-29 10:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e0f79a940ceb698812772258286e6348 SHA-1: ee180dafb75423bf89dc6948db52d9617f1d2f76 SHA-256: 3c15036c2dd9211314c5304e8b025e801ede5ec8536d2e765b6994eb20ac11b5
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains strings that appear to be part of a lure, such as 'Mackie sr32-4 service manual'. The embedded links, many hosted on disposable domains, are designed to redirect users to potentially harmful content, aligning with phishing and redirection attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://yafferge.ru/strik?utm_term=mackie+sr32-4+service+manual In PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/vhbjaha/63858617364.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosira/jo8G6hc/84669286901.pdfIn PDF document text
    • http://jesofafisozosa.iblogger.org/blackinton_badge_order_form.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/wings_of_fire_book_5_graphic_novel_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/ibjgid1/sewobisazininetegopomitug.pdfIn PDF document text
    • http://tuderoba.getenjoyment.net/zosotod.pdfIn PDF document text
    • http://goranefadosire.iblogger.org/98097203886.pdfIn PDF document text
    • http://sufofure.mywebcommunity.org/zebra_barcode_printer_gk420t.pdfIn PDF document text
    • https://cdn.sqhk.co/derilunadine/hiiojhp/xosiluromevinidox.pdfIn PDF document text
    • http://lezobul.medianewsonline.com/57913583496.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/gfjjegh/batozot.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/jcGIXBK/word_chums_cheat_project_lexicon.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/historia_del_dibujo_arquitectonico.pdfIn PDF document text
    • https://cdn.sqhk.co/wisivelu/fihiidx/razer_keyboard_switches.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://misupegadux.epizy.com/algebraic_and_geometric_topology.pdfIn PDF document text
    • http://rafoputoxuxu.epizy.com/exhibition_enquiry_form_template_word.pdfIn PDF document text
    • http://babijegogaluz.epizy.com/antidiabetic_activity_of_medicinal_plants.pdfIn PDF document text
    • http://janorenojitafal.epizy.com/fisalokanoxevufite.pdfIn PDF document text
    • http://wirodugapilab.epizy.com/cutting_edge_knives.pdfIn PDF document text
    • http://mujujum.epizy.com/difference_between_primary_and_secondary_drinking_water_standards.pdfIn PDF document text
    • http://zotozonon.rf.gd/vegekufatudulujasu.pdfIn PDF document text
    • http://kevulapoxokimif.rf.gd/39479698239.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 5180 bytes
SHA-256: cf4ab130a99827036409cb8ba58d4c0c1e464f88bcb70852743d873109661e3f
font_01_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 11560 bytes
SHA-256: 4e67b3132275067195f6e133920ee369e260ff8b664ba0164f4a581d845e9829
font_02_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361