Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8390daf76806ce8…

MALICIOUS

PDF

83.6 KB Created: 2021-02-11 03:25:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 44f7e041c558f5cf449d8434830f83e2 SHA-1: e29747a10634fab8fae28709d01e36728a2fb0c4 SHA-256: a8390daf76806ce84c171e219bade9fd7b2ce5858071436ed4d3005b36fa950b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to academic material, directing users to external sites.

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://crophysi.ru/123?utm_term=halliday+and+resnick+fundamentals+of+physics+pdf PDF link annotation
    • http://bunnygummy.ru/biology_arizona_karyotyping_activity_answershlvot.pdfIn PDF document text
    • http://czecheducation.space/atwater_beach_surf_reporthtqnb.pdfIn PDF document text
    • http://gakmancreatures.ru/lojudetupebox5mrp.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/883313433436fvmx.pdfIn PDF document text
    • http://nesobaka3.xyz/xugitobelutilijtgwp.pdfIn PDF document text
    • http://socialwave.me/vowiradebadubesutawaroklcg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380403/normal_5ffa71364297b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_5feed7a271b8f.pdfIn PDF document text
    • http://shopwithsale.website/99585806623c9ab9.pdfIn PDF document text
    • http://worldhold.online/zebra_zt410_service_manualhvjh9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5ff6c0ed8be7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_600dd0c975bb2.pdfIn PDF document text
    • http://boevoenlp.com/break_even_analysis_chart_excel_templateawtg7.pdfIn PDF document text
    • http://testrun.ru/diwigagasoxefinuvg568a.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/asiaone_app_for_androidrbbch.pdfIn PDF document text
    • http://fb-pageunderreview.com/ratiwozs55g.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/goveruduzewoxu/93590389573.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/vader_jacob_sheet_music.pdfIn PDF document text
    • http://xeravujowa.epizy.com/ff6_lethe_river_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/filmywap_bollywood_movies_2019_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 5524 bytes
SHA-256: 99613be0f9fabb1ce24d16dd92708b04e87fea1512754c04c28c773e2794be39
font_01_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 11404 bytes
SHA-256: aa78c200ad51390660e9d32d5b39c0fb9107534f0e45fddc778cd6d95b9f0f8b

Open this report in the interactive analyzer, or submit your own file for analysis.