Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fa0ecf3b7d7b18…

MALICIOUS

PDF

73.4 KB Created: 2021-04-10 10:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a67a242ee2200f8f6fb4f273d8342b2d SHA-1: 26b8c31871b1c476241b51312e98dad2bb555a92 SHA-256: 65fa0ecf3b7d7b186e531f0bffbf5f135dab6d6bbef14c2ccb0f1eb18eb549b0
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains references to 'horoscopo de hoy vida y familia escorpio' and includes a suspicious URL, 'https://maypoin.ru/strik?utm_term=horoscopo+de+hoy+vida+y+familia+escorpio', which is likely the primary lure. The PDF structure and embedded content suggest it's designed to trick users into visiting this malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=horoscopo+de+hoy+vida+y+familia+escorpio PDF link annotation
    • https://cdn.sqhk.co/ruwopazeg/cihgghb/alliant_2_ordering_guide.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/zokuxujaxujiwibufitaki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424632/normal_5fc7ea4c1bffb.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/hjhhhfM/rikutarakunazutukulev.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/atomic_mass_and_atomic_number_of_all_elements.pdfIn PDF document text
    • http://wifisef.medianewsonline.com/chiller_york.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_5c01a3d289a5406eb22cdbfa815980e1.pdf?index=trueIn PDF document text
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_7b1c35377b7843b5b92c749647015a89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6475dd6-f95e-4244-be56-8c9f29526352/el_espejo_enterrado_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f1fdc7-5daf-413d-8993-28f71cc1d2ad/73461814499.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/13503130345.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/game_chocobo_racing_cho_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f227edcf-bee8-4bfb-9b32-188215b70aa4/97395245845.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/arsenal_vs_burnley_goal_highlight.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/baby_babble_unscramble_answers.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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 5520 bytes
SHA-256: ef65e5850ba0e155c6617a4e7e919bd70ee7ed93c36761a86ad22c6fd297e447
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 12260 bytes
SHA-256: 5cd08a339e74cf4a4a6f59369e45880ce4208a331fea83e5e5e361550b6f94e4

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