Malicious PDF — malware analysis report

Static analysis result for SHA-256 423f0063373623c9…

MALICIOUS

PDF

72.0 KB Created: 2021-02-15 10:14:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 100bab6b69e17b599d628b3e3b40b3f2 SHA-1: 3af9fd1504c12007e15a5ea417289242f387a29a SHA-256: 423f0063373623c99b9c5dfd10ee75c3cd0151794ae1ba8aa36f9f7d1c4b8b4c
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it is a phishing or malware distribution attempt. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The presence of SEO-related terms in the URL suggests an attempt to lure victims through search engine results.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=florida+virtual+school+drivers+ed+final+exam+answers In PDF document text
    • http://dronextactical.xyz/gupadufifelipetojinuvpfbz.pdfIn PDF document text
    • https://vitasexabu.weebly.com/uploads/1/3/0/8/130813400/5068887.pdfIn PDF document text
    • https://lamonide.weebly.com/uploads/1/3/4/0/134096931/7597b.pdfIn PDF document text
    • https://rogusavonovupe.weebly.com/uploads/1/3/3/9/133997589/985bddd39cd4b.pdfIn PDF document text
    • https://xelopapet.weebly.com/uploads/1/3/0/7/130775154/e6f14ce.pdfIn PDF document text
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/99506f2e79.pdfIn PDF document text
    • http://indital.space/foxopijix7f5fj.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/bjizggG/download_modern_air_combat_team_match_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/ggNia9j/amc_the_walking_dead_season_10_episode_1.pdfIn PDF document text
    • http://servisvds.ru/tesupimemotiritup11uec.pdfIn PDF document text
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/7cc81185420.pdfIn PDF document text
    • https://rosavipufek.weebly.com/uploads/1/3/5/3/135315232/f84f1d83.pdfIn PDF document text
    • http://serviceforyou.site/nurumavelufuridlnw9q.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/ljiXGJj/43604431583.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/gcPgije/how_to_make_a_bulleit_bourbon_old_fashioned.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/domowesomizev.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_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 5436 bytes
SHA-256: 4314b16cc1efd750fa83c4139bdba395639ab27f97e0fac625c57c37ac642b42
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 10460 bytes
SHA-256: d8ce3dacf5872d2dd72de2b50b27432b53f93ff3ea5a0a081bab34cc0accfd90

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