Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f26dd9df8623c53…

MALICIOUS

PDF

79.7 KB Created: 2021-02-16 05:01:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4b58d90fbc7abc9b77f1401470a7ad86 SHA-1: 9beeed0a9e174d52aa80d3975909331755e7797f SHA-256: 7f26dd9df8623c53960f6abd12b95cc3759af2efc3c0cb1492a1f37fe5b1455c
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://seumenha.ru/strik?utm_term=what+is+the+us+gdp+gap PDF link annotation
    • http://www19216801.site/hunt_showdown_hidden_achievements_steamu7io6.pdfIn PDF document text
    • https://juduloto.weebly.com/uploads/1/3/5/3/135323899/bab19a.pdfIn PDF document text
    • http://bestgirl69.com/the_stranger_by_albert_camus_quotesv8cjq.pdfIn PDF document text
    • http://gtomishebs.xyz/futizemasokorelamph9he.pdfIn PDF document text
    • https://jipagulus.weebly.com/uploads/1/3/1/3/131379543/jenab_tivonunoge_vegujufedoved_xivujaposuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_600b6328c2000.pdfIn PDF document text
    • http://reduslim-buy.site/analysis_of_skeletal_remains_worksheet_answersles2a.pdfIn PDF document text
    • http://bigowet.xyz/rorum6g2to.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486051/normal_6003213344c7c.pdfIn PDF document text
    • https://dotuxebi.weebly.com/uploads/1/3/1/4/131454754/1743002.pdfIn PDF document text
    • http://retys.fun/jaketogawutumuvuwelatuke0jgzk.pdfIn PDF document text
    • http://poopo.ru/agenda_2018_freea1v6s.pdfIn PDF document text
    • http://merishwheelrecords.com/13752008224xoiq3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuxekesimulir.epizy.com/daintree_rainforest_information_report.pdfIn PDF document text
    • http://femasusatatovet.epizy.com/android_room_update_multiple_rows.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 5108 bytes
SHA-256: 5d59ff17245eb203b34f1ff6b0a38c86c9f5a824817eed266015c12fb92a2237
font_01_sfnt_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 11552 bytes
SHA-256: c9e64edb467a4277e93fe57326a12670d33a78f53255a1249d8f755a71809a60
font_02_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 16112 bytes
SHA-256: 04c641d0aedeaa8c494855f42a2e9ae6fad9e3679126e7dc5c08fccc4b41c292

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