Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b458931f68d21ad…

MALICIOUS

PDF

74.8 KB Created: 2021-02-27 18:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f29b3ea451013d23f1f006c0dcf577d7 SHA-1: 85b0b379a01aa9b9265f0ec2adf749a95360af19 SHA-256: 5b458931f68d21ad3225c4f745a28fbeb5519dacc636627aafa16ac29f8dfd6d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'nipisod.ru', suggesting it's part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host multiple links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=carte+de+l%2527europe+2020 PDF link annotation
    • http://voyazh-shina.com/5e_battlemaster_character_sheetpa786.pdfIn PDF document text
    • http://hookup755.fun/geekbench_4._3_apkma8tp.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/35782031399.pdfIn PDF document text
    • http://gufolosolikivu.22web.org/96378413704.pdfIn PDF document text
    • http://vseti.life/ao_smith_promax_water_heatermd18j.pdfIn PDF document text
    • http://fb-ig-copyright.com/lethal_race_hacked_gameogkwr.pdfIn PDF document text
    • http://jakartapro.xyz/job_mania_eternal_dungeon_apkoub4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawokale.myartsonline.com/feeling_faces_coloring_pages.pdfIn PDF document text
    • http://lusiromipu.epizy.com/break_even_analysis_questions_and_answers_ppt.pdfIn PDF document text
    • http://suferipuwa.epizy.com/carnal_knowledge_and_imperial_power.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/37121691875.pdfIn PDF document text
    • http://watidoterer.epizy.com/15584657424.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/3652492629.pdfIn PDF document text
    • http://zadizufosa.rf.gd/how_to_use_aquarius_water_flosser.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/14497517981.pdfIn PDF document text
    • http://ruxuwidoke.epizy.com/turuwitaturoxixelexozona.pdfIn PDF document text
    • http://fitatina.rf.gd/duxivalojif.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_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 4988 bytes
SHA-256: 40416c26b0ae2ee1c32ccae16e8797119a6e73cffe20a7ac777ae65c9ea67779
font_01_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 15764 bytes
SHA-256: e4a28c18d46b73ca816bbf8c5fc37152119850f3a1f4999f0e98bbacf38deaa2

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