Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33a52c50b9be6f2…

MALICIOUS

PDF

71.5 KB Created: 2021-04-03 19:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f9484bf02d7bc0d7b735229e8f1d296f SHA-1: 912ef44bd19950deda6ba763bb171e89f5ae2817 SHA-256: d33a52c50b9be6f2bba0c57a566a75c7c4284d0b8e6f52ebf1cc3a876157e04e
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting strongly suggest this document is designed to redirect users to malicious sites for further exploitation or credential harvesting.

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://golowaki.ru/wix?keyword=toshiba+50l1400u+wall+mount PDF link annotation
    • http://jatudoz.getenjoyment.net/wejivisakitagabaxab.pdfIn PDF document text
    • http://cookwellbakewell.com/78223653939zak7a.pdfIn PDF document text
    • http://semengergel.ru/bixagixilizubila97ik9.pdfIn PDF document text
    • http://mscredit.info/printable_macaron_templaterdski.pdfIn PDF document text
    • http://eglo.club/sawowokajoluwubedubibivy1614.pdfIn PDF document text
    • http://evatopshop.xyz/my_book_of_memories_by_frederick_holbrookf8s0d.pdfIn PDF document text
    • http://creditscorefix.info/kudetepigu859zm.pdfIn PDF document text
    • http://bitsracing.net/electronic_battleship_advanced_mission_instructionsx8b52.pdfIn PDF document text
    • http://roskycnmx.com/71116226228bqzfr.pdfIn PDF document text
    • http://fullstacket.online/which_of_the_following_is_an_example_of_data_mining8yoq5.pdfIn PDF document text
    • http://olipaka.xyz/r_b_music_youtube_video_gap_band08kvr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_893adcdb7edd4bb2b60c0d1da295bf2f.pdf?index=trueIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/25384020549.pdfIn PDF document text
    • http://turomidujamo.epizy.com/67225383007.pdfIn PDF document text
    • http://xetorofowuwid.epizy.com/atresia_esofagica_tratamiento.pdfIn PDF document text
    • http://xaxotatizomeno.rf.gd/arcsoft_photoimpression_3_software.pdfIn PDF document text
    • http://xukiwelufa.epizy.com/kenmore_quiet_comfort_humidifier_parts.pdfIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_54486deff55646449470fcc9f01c95ed.pdf?index=trueIn 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_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 5416 bytes
SHA-256: 36c8f1f3a46e07d164722eb17bde17d8f75c0c0662efbcd3cab50c4ea7596396
font_01_sfnt_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 10804 bytes
SHA-256: f0113a4689937c35e6cb83937568068a0977879c208989deaa51cf33f7398377

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