Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fc81e0f41da8a5…

MALICIOUS

PDF

75.2 KB Created: 2021-03-19 08:54:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b02cc1bafe5efce1159261c21de8179 SHA-1: 2e96d87a735b2112caa3c0d71d281ce2fd1285ed SHA-256: 88fc81e0f41da8a55447f79057e8136e7110a16be3de8e343d79def1b93cab00
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/aws?utm_term=hydroranger+200+ultrasonic+level+controller PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391326/normal_6014730446ccf.pdfIn PDF document text
    • http://reduslim-europa.site/iphone_6s_schematic_download8in2u.pdfIn PDF document text
    • http://italysummer.fun/lunigivolizxgknj.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/fagfjgA/transferwise_incoming_wire_fee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_602daa42681ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459466/normal_5ff170b329606.pdfIn PDF document text
    • https://cdn.sqhk.co/fezavomol/jiieib1/9196833910.pdfIn PDF document text
    • http://job-finder.space/how_fast_will_a_49cc_scooter_goor6w0.pdfIn PDF document text
    • http://reduslimitalia.site/sig_sauer_p250_compact_22lr_reviewceb1s.pdfIn PDF document text
    • https://cdn.sqhk.co/zawileveruz/gfqihJk/sherlock_holmes_abominable_bride_sub_indo.pdfIn PDF document text
    • http://mysteps.online/29838767002tmxrh.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/fjcdie5/ximidisebotubojakixejorit.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/lakadutof/9892932376.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/38746110979.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/elements_compounds_and_mixtures_worksheet_grade_8.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_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 5504 bytes
SHA-256: e82729b9b2c24c94a2324a17e30d1dc0da843706d18d9ce23f43ec76267eac74
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 10956 bytes
SHA-256: d5ae806df71a1f93ec3b4cbdd67dd12c68bfb418829c53206d3fa5cda0546864

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