Malicious PDF — malware analysis report

Static analysis result for SHA-256 400ee246cf3ce2cb…

MALICIOUS

PDF

99.9 KB Created: 2021-02-24 05:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 510c8f958276c7e64892f52e4352217c SHA-1: bc8e4a4cbdad3be9e94decb20e4d0d17b098c175 SHA-256: 400ee246cf3ce2cb83506ec910b37a00b8835c26771f7efb3ead826e7972dd99
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm. The PDF structure and embedded content suggest an attempt to lure users to external sites, which could host further malicious content or phishing pages.

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
  • 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://jacksth.ru/wb?keyword=toro%20super%20700%20sprinkler%20head%20for%20sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418180/normal_600bfc032e641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452377/normal_6025188ca6211.pdfIn PDF document text
    • http://ita-fitness.fun/tabasoruretinodigugudu7t5l3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407327/normal_5fd10deaaebe7.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/sODyibD/swamp_thing_2020_cw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461201/normal_5ffbb6994fdc5.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/jbifDji/97511106807.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/ejjgjgc/ligogulexenofek.pdfIn PDF document text
    • http://umdtheatre.ru/pelcula_de_titanic_completaro792.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/vhcBify/90363205800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445338/normal_60084ec91b68f.pdfIn PDF document text
    • http://rmk4sale.xyz/application_form_format_in_excelgrhl8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5ff6259944943.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://xegefonupekowa.epizy.com/degree_of_comparison_worksheet_for_class_3.pdfIn PDF document text
    • http://pufagaduvamoj.rf.gd/52333906972.pdfIn PDF document text
    • http://wafidifu.rf.gd/dudotokazadoxuzulovol.pdfIn PDF document text
    • http://mologesasik.epizy.com/barerovifesutabukis.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 6744 bytes
SHA-256: 168f2717c0f8bf403ea9c75be00852470ae846c6c718186f95322882c1c07e87
font_01_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 5164 bytes
SHA-256: f569d47f8d863a1c496477c8db4a11aa4d612d3346d65315bcb616cc3ee1a150
font_02_sfnt_off00011596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11596 9404 bytes
SHA-256: 52a18d72aa5a14a38843f8916d4108ac51092951028d024e20afeedde51b322f
font_03_sfnt_off00013333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13333 11368 bytes
SHA-256: acac661ef1f3737cf5f39087755b8500c596e8a52ce2b075e39fceb6b8edbe67
font_04_sfnt_off000159ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159EF 16800 bytes
SHA-256: 605b7017c679d4221632e6eec706faf6d729e510fa38ced52923091a91cc0fd0
font_05_sfnt_off0001715c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1715C 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c