Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f803c8a4fa560e…

MALICIOUS

PDF

105.1 KB Created: 2021-03-23 08:55:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 82c5b3e46e2820aa7a0690167eaa776f SHA-1: ee5992c06a3b792aa37484ae126b3e1a74122c7b SHA-256: 96f803c8a4fa560e7456aea5dcceae61e67d90e263ac88bfa9aeb696a47f3a5e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to search terms, directing users to external sites. The presence of multiple external URIs and link farm heuristics indicates a phishing or redirection attempt.

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://fokemale.ru/award?keyword=canterbury+tales+prologue+translation+pdf PDF link annotation
    • http://zesenadozefut.sportsontheweb.net/c_language_notes_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/vokipidelad/Azjcjeh/calibri_bold_italic_font_phonto.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/will_winds_of_winter_be_released_in_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/Rrgghja/rexopo.pdfIn PDF document text
    • https://cdn.sqhk.co/jategumeb/ijcqhgL/6766657291.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/45968115049.pdfIn PDF document text
    • http://tiktokfrance.fun/contrato_de_apertura_de_credito_mercantil_formatomuome.pdfIn PDF document text
    • https://cdn.sqhk.co/bemapebe/jibAicF/xodisajiwigutibelamosik.pdfIn PDF document text
    • http://marketitaly.pro/92643068652nfilx.pdfIn PDF document text
    • http://xevedudox.sportsontheweb.net/dozap.pdfIn PDF document text
    • http://bonmarket.site/asus_p7p55d-e_pro7u0kb.pdfIn PDF document text
    • https://cdn.sqhk.co/mekerijiwuv/bhrjhgh/bodabakajowofavid.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/il1b82l/highway_agency_driver_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/belexewuwif/dChcbjb/vadimipipogos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punotonaduwize.atwebpages.com/68334262964.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/38973856926.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/kegakuvawigazo.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/72117624172.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/gre_quantitative_reasoning_sample_test.pdfIn PDF document text
    • http://sinusisokopex.atwebpages.com/materiales_dentales.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_off00015d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9B 5356 bytes
SHA-256: e3c53c3470312aa7c8d17b455dc5028f7e94eefc4d3b8e9b34ab1aabdad0d991
font_01_sfnt_off00016fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FE0 12000 bytes
SHA-256: fa9bd4f17028669869749a901fcf3c1198c1023a649dee00985dd727f1725676

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