Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25dcef4541a75de…

MALICIOUS

PDF

95.0 KB Created: 2021-01-18 07:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 776df92f6b7c033c164535956644494c SHA-1: 1dde04c1df308650fce2aa051e8669ab531cc4c9 SHA-256: f25dcef4541a75ded725327ad7125840a7ccbf1966dd02669920262c5a07049f
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document is classified as malicious, containing links to known malicious redirectors and employing a remote-support tool lure. The document body, though heavily obfuscated, appears to be a lure related to 'prentice hall federal taxation 2012 solutions manual pdf free', suggesting a phishing or scam attempt. The embedded URLs and the nature of the lure indicate an attempt to trick the user into downloading a second-stage payload or engaging with a malicious actor.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://traffine.ru/123?utm_term=prentice+hall+federal+taxation+2012+solutions+manual+pdf+free In PDF document text
    • https://site-1192441.mozfiles.com/files/1192441/winifexiduludavabakabek.pdfIn PDF document text
    • https://cdn.sqhk.co/nakusunegud/6jghgha/zexumasani.pdfIn PDF document text
    • https://site-1177729.mozfiles.com/files/1177729/plague_inc_evolved_pro_apk.pdfIn PDF document text
    • https://site-1174515.mozfiles.com/files/1174515/27818840301.pdfIn PDF document text
    • https://cdn.sqhk.co/mulepava/de8iejg/xekilamogobofisotibojegew.pdfIn PDF document text
    • https://site-1174752.mozfiles.com/files/1174752/constitution_usa_built_to_last_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/iULhchi/fashion_mall_shopping_craze_makeover_games.pdfIn PDF document text
    • https://site-1175129.mozfiles.com/files/1175129/18719575743.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/bA0j9gf/dibasic_sodium_phosphate_dihydrate_usp_monograph.pdfIn PDF document text
    • https://site-1194666.mozfiles.com/files/1194666/buguduropufegetiz.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/sjijShg/rozipoxasejavelilef.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/hgCxfjc/gagimuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5fb8e6b98bcd7.pdfIn PDF document text
    • https://site-1177298.mozfiles.com/files/1177298/mafia_city_h5_business_zone.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/lekizopiloref/impact_of_4th_industrial_revolution.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_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 5792 bytes
SHA-256: 252fb584a88bb44af344aa9472948dbab167cee718d017a804a08664db098019
font_01_sfnt_off00014318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14318 12916 bytes
SHA-256: ee6bf96921b76c29073c8b7defcc7577faa940cda7bb87650f1968ed879e589f

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