Malicious PDF — malware analysis report

Static analysis result for SHA-256 703bb8c969e74813…

MALICIOUS

PDF

79.2 KB Created: 2021-03-17 17:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 953dee5103ad651a02a3e43a837aa215 SHA-1: 9fca5e2b61212cc4bb9a1db34759240e77c0bee5 SHA-256: 703bb8c969e748132a3f68e6dd59abe40085b9e85c62821623a5456687ab5bf9
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'golowaki.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it's designed to redirect users to external, potentially malicious, sites.

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://golowaki.ru/123?utm_term=the+sims+4+parenthood+game+pack
    • http://belkwigs.com/what_is_meant_by_bill_of_exchange_definition25v84.pdf
    • http://gouliwer.online/ryobi_table_saw_extension_kit9uyft.pdf
    • http://maslovauto.ru/fallout_76_tank_buildy2l7y.pdf
    • http://5coupon.info/what_are_the_basic_laboratory_techniquesnctqv.pdf
    • http://gitilapen.66ghz.com/1487052381.pdf
    • http://sejapamuji.22web.org/65247376442.pdf
    • http://chunyoo.com/psplay_psp_emulator_apkicn6f.pdf
    • http://dorightpress.com/78388005265kt9jf.pdf
    • http://leftoutclub.com/jarulatowenafmhgfd.pdf
    • http://stroiline74.ru/fifty_shades_of_grey_full_movie_download_filmyzilla_in_hindif7z7m.pdf
    • http://simupujumojata.22web.org/easy_bachelor_cookbook.pdf
    • http://uber-global.com/47597603114e2ku8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wizidimawag/68692412423.pdf
    • http://buzelijakozesi.epizy.com/conservation_of_energy_lab_report_physics.pdf
    • http://wirijabi.rf.gd/asuran_movie_theme_bgm_free.pdf
    • http://divimoxigorube.epizy.com/87164083453.pdf
    • https://s3.amazonaws.com/mijumomub/bazavamagumo.pdf
    • https://s3.amazonaws.com/ninasivol/year_3_grammar_worksheets.pdf
    • http://setebuvoterir.rf.gd/92852955213.pdf
    • http://supikovibamukip.epizy.com/how_to_read_fault_codes_on_kitchenaid_dishwasher.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6df.bin
ec4208c6e05edaf624e2f9a4bc9e6b981f5dc5060e73d3710155763c0d1112de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 5556 bytes
font_01_sfnt_off0001099b.bin
7f339c28c5796ee82253ca2bb7752986a3c368f8b76fffbb56abcc31283ac157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 11024 bytes

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