Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1f1af83b838d1e…

MALICIOUS

PDF

78.8 KB Created: 2021-02-23 23:15:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c88b72a5ed4a1cda076ced9f0bb2b3a1 SHA-1: 5da7b567ba8af33e2dfcb9d134d1808dd62a201e SHA-256: 8a1f1af83b838d1e615dea29dd1ec13c85591eb7494b50a871ab4143355dc9c9
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 0.9996

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://druttle.ru/wix?keyword=ch+digraph+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/rorajakura/Bifeji0/frases_tumblr_sobre_amor_proprio.pdfIn PDF document text
    • http://4gusevshop.website/gufitopegej8mt.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/ihiifyn/lobster_trap_asheville.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457298/normal_5fe2cdb889b82.pdfIn PDF document text
    • http://fisuruwibowin.66ghz.com/43839927091.pdfIn PDF document text
    • http://topstudy.fun/91203281480hilw3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404310/normal_5fe2f2c853eb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380528/normal_602d559b380bb.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/ijzieOB/guruxugekodu.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/ZOjeifl/41477039564.pdfIn PDF document text
    • http://file-id.ru/consola_retro_pixel_classic_300_juegos_rojogtab1.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/somamere/online_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/pan_card_application_form_2019_nsdl.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/works_cited_page_mla_format_word.pdfIn PDF document text
    • http://vofopinalog.epizy.com/kadiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/swift_numberformatter_percentage.pdfIn PDF document text
    • http://zitejilid.epizy.com/54850602672.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 5332 bytes
SHA-256: b05d3b542d3845f834c2d87975abd0e1b97e98a9459bfe84194403c635a22ea1
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 10116 bytes
SHA-256: 345907dbebb71e13c07c132f031b0b781d95bda589adb19908ab7790e6276ae8
font_03_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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