Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8db69477e1731c5…

MALICIOUS

PDF

85.9 KB Created: 2021-03-19 14:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1a7bc7e42eeddb092ade0dde8eece25c SHA-1: af5ed36111ba253af6582de63a4094eeec05b4da SHA-256: b8db69477e1731c5ba22fc17beb12fd7e70af7a0bd4d81ee677261a62fef6a24
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-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://mezovuduw.ru/award?keyword=download+pdf+to+excel+converter+apk PDF link annotation
    • https://cdn.sqhk.co/tokotuxajif/cwiajcw/61434055354.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/certificado_de_secundaria_sep.pdfIn PDF document text
    • http://nipilexunelok.22web.org/93300607630.pdfIn PDF document text
    • http://chategratis.online/99035478038xn93w.pdfIn PDF document text
    • http://mon-compte-cmb.best/64570634635byxt9.pdfIn PDF document text
    • http://verenica.net/lightning_protection_level_calculation2wp0k.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/write_a_conditional_statement_that_the_venn_diagram_illustrates.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/luzuruleywlzy.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/iiiCoAV/western_suburbs_bowling_club.pdfIn PDF document text
    • http://xexogafuko.22web.org/rosadamodufijekugowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_6051a61ce5ce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_60392934be4f5.pdfIn PDF document text
    • http://laketofetujeso.medianewsonline.com/allures_45._9.pdfIn PDF document text
    • http://kuxasubofutako.iblogger.org/ap_enadu_telugu_news_paper.pdfIn PDF document text
    • http://bitsracing.net/101562526222juzl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453100/normal_60066b0668cdf.pdfIn PDF document text
    • http://zifirarukax.22web.org/anytone_at-_6666_service_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemunedipu.rf.gd/80725782879.pdfIn PDF document text
    • http://xerifuxedu.rf.gd/rajefun.pdfIn PDF document text
    • http://sufumawug.epizy.com/tumblr_all_images.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 5252 bytes
SHA-256: 04f76b99afc1d49fc749e6411b2a2597057624cc284a1a1caa2477a57829c4dc
font_02_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 13436 bytes
SHA-256: ca5fbe2d78ebc6a68cf7961f7ac22b48bf816db540b785aac8cc74e3dafb9992
font_03_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 16148 bytes
SHA-256: 64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b

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