Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e21b08837da9c2…

MALICIOUS

PDF

77.3 KB Created: 2021-03-01 16:36:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a58442c74aa615cf4208c51013ee56ff SHA-1: d58a7523441f0a345ff9699ed79cc9872aaa7c09 SHA-256: e8e21b08837da9c25b83b0f0e47b48385eedbcc09e180e79c35ca9004f208e25
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-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://gimoguvi.ru/123?utm_term=legend+of+the+blue+rose PDF link annotation
    • http://weviwoza.22web.org/venupanimorojewizi.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/hb7VrNJ/swat_movie_2019_trailer.pdfIn PDF document text
    • http://fastgetme.online/dd_best_3rd_level_wizard_spells2yyru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423780/normal_60047f3f1b07e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_60184bc502378.pdfIn PDF document text
    • http://baltika-trans.com/61277016600vuulk.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/jdgcha7/8333403639.pdfIn PDF document text
    • http://umdtheatre.ru/nvidia_geforce_7300_le_driver_windows_76xmx8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5fdd2fe149fcf.pdfIn PDF document text
    • http://tdsevsvet.ru/does_subway_nutrition_include_breadb5fvt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482424/normal_6013ca7612376.pdfIn PDF document text
    • http://moresukko.ru/zamifebanokedp0erm.pdfIn PDF document text
    • http://zafuwozemupojaw.22web.org/what_are_some_project_management_methodologies.pdfIn PDF document text
    • http://fly-drive.online/best_free_antivirus_for_android_phonescl5hi.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/g9hfjb1/losofojukad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daxogatuje.epizy.com/24289802396.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/67680193638.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/video_from_twitter_dm.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_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 5040 bytes
SHA-256: a5a481f07dc4a71b183cf9bee66348b8964a48b0021ca316aed65c2e661dd95c
font_01_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 10120 bytes
SHA-256: 9963d6579f7cffb31f2103c50a1553c533144e79015ec34088eef788d6bfe067

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