Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24d5ce962ce3c4b…

MALICIOUS

PDF

97.0 KB Created: 2021-01-20 11:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 47986571f832aa1f549bf94f0706cf67 SHA-1: 7cf8b663a39111e75367cff3452310075b46d1e6 SHA-256: f24d5ce962ce3c4b53ed36d5a99556f59eea416cb0f2ac043fdcfe438f3ba3d1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded links are designed to lead users to potentially harmful websites, likely for credential harvesting or further malware delivery.

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
  • 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://traffking.ru/123?utm_term=senior+resource+group+walnut+creek In PDF document text
    • https://raguwamirib.weebly.com/uploads/1/3/4/6/134630778/9043545.pdfIn PDF document text
    • https://site-1174888.mozfiles.com/files/1174888/43551434304.pdfIn PDF document text
    • http://fomilexavekol.22web.org/kisixofo.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/Rjbjbja/big_bang_theory_theme_song_chords_piano.pdfIn PDF document text
    • https://site-1176797.mozfiles.com/files/1176797/strike_team_online_mod_apk_unlimited_money.pdfIn PDF document text
    • https://site-1177423.mozfiles.com/files/1177423/ftdi_cable_pinout.pdfIn PDF document text
    • https://site-1226241.mozfiles.com/files/1226241/alcanos_nomenclatura_iupac.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/hhihetG/dipirijatipufamufupupa.pdfIn PDF document text
    • https://tezijetukiresu.weebly.com/uploads/1/3/5/3/135394197/fa80c2.pdfIn PDF document text
    • https://nagagixibedixu.weebly.com/uploads/1/3/1/6/131606435/tajixovobujozusopa.pdfIn PDF document text
    • https://zotagozugub.weebly.com/uploads/1/3/0/7/130739891/wutirodizerofi.pdfIn PDF document text
    • https://site-1174433.mozfiles.com/files/1174433/sekelefixutasiwod.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/mokuwanibof/androidx_test_version.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E91 5360 bytes
SHA-256: f02a6ef458a113acfcc025676fb673173340b6c96106194ee8f0aa286a3675bb
font_01_sfnt_off000130f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F0 12248 bytes
SHA-256: fad773dd3ddacc478ce6cbd230b9976ab92eed76b1c092836f8fc2ba931f504e
font_02_sfnt_off00015aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEF 18604 bytes
SHA-256: b4c8faf427b1da8ebea409cab2e87880abd3c1584731cefcb074cc02dd37c286

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