Malicious PDF — malware analysis report

Static analysis result for SHA-256 1234390e2d417d16…

MALICIOUS

PDF

84.9 KB Created: 2021-02-25 20:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 384e0801b3ce84fd100f8bb9f7418242 SHA-1: 96cbf92477b4d8175f8cc56951e3a5032c88e043 SHA-256: 1234390e2d417d1660e33de3e1ae30be244652e4974628216eea95c16f0ea7d2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is directly related to downloading an APK, suggesting a lure for users seeking applications. The presence of external URIs and the overall structure indicate a phishing attempt to redirect users to malicious content.

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
  • 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://druttle.ru/wix?keyword=shadow+fight+apk+download PDF link annotation
    • http://pochta-24.cc/robot_carnival_cloud4wfc6.pdfIn PDF document text
    • http://greyfruit.space/2007_chevrolet_impala_lt_3.5l_v6_flex-fueluhvww.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/nipelir.pdfIn PDF document text
    • http://pay-order.info/bizhub_c224e_firmwarew3fl7.pdfIn PDF document text
    • https://cdn.sqhk.co/xoberuweri/bhbidfx/majivapo.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/9X4hawH/mivufiwuxusuv.pdfIn PDF document text
    • http://straponartist.com/44361602624y1rnv.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/hjiijiR/html5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368760/normal_5ff755f675481.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/jeicT0V/drill_master_angle_grinder_replacement_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_5fd31787d2c7f.pdfIn PDF document text
    • http://upgrade4me.com/essentials_of_business_law_10th_editiondh3ex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 11348 bytes
SHA-256: dfa26fb2cc7b2c71fa2a63fefcdb5785945acaf54ffc98b72540c8c8ea5b3a10
font_01_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 5288 bytes
SHA-256: e9f681c33e010d1ed105ffe825bd472d9f3b80c0928a9f22adf26ea702d8e024
font_02_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 11492 bytes
SHA-256: d40e85ed4779224367a19666d9c6746bb094596a6d95f5c03d8dc17c966774f0

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