Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b70c6693f696de9…

MALICIOUS

PDF

68.8 KB Created: 2021-01-23 15:15:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7ec7e3da70435a4679f3bb06f718113 SHA-1: d7a68984a998d2c257d87c95cb49e28e7b41eb18 SHA-256: 1b70c6693f696de955fcd15462e279081600dee6e28dfe33f95eb08f0d74a050
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded URLs, such as 'https://yafferge.ru/123?utm_term=wherever+you+will+go+chords+tabs', are designed to redirect users to potentially harmful content. The document's structure and embedded links suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=wherever+you+will+go+chords+tabs
    • https://static.s123-cdn-static.com/uploads/4369498/normal_5fee67dbb4eaa.pdf
    • https://site-1176587.mozfiles.com/files/1176587/vevizaridixulixameri.pdf
    • https://site-1168077.mozfiles.com/files/1168077/xetixajidanotozevafoki.pdf
    • https://cdn-cms.f-static.net/uploads/4377128/normal_5fd0e1841ab6e.pdf
    • http://roralopokuzej.22web.org/weight_unit_conversion_table.pdf
    • http://wavarev.22web.org/naxebawuvoluvexumele.pdf
    • https://site-1253381.mozfiles.com/files/1253381/22203875413.pdf
    • http://mabirimelu.iblogger.org/mitepal.pdf
    • https://static.s123-cdn-static.com/uploads/4373983/normal_5fe0ca61d5a65.pdf
    • https://site-1212674.mozfiles.com/files/1212674/easa_pilot_logbook_excel.pdf
    • https://static.s123-cdn-static.com/uploads/4411229/normal_5fc7b3d3167cc.pdf
    • https://site-1166655.mozfiles.com/files/1166655/runulaxekug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xesidif.epizy.com/zusomo.pdf
    • http://womutefipile.epizy.com/53049815455.pdf
    • http://komivarutu.epizy.com/budhdev_aur_badrinath_game.pdf
    • http://ketanuviz.epizy.com/arris_surfboard_sb6190_user_guide.pdf
    • http://nekaxikafixof.epizy.com/39129937284.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c792.bin
b3b134dd4e066b7727d6eb36a4901c0e45878c2ec5c0df858cb1f90ff8366cd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC792 5608 bytes
font_01_sfnt_off0000dac4.bin
e3e0e1f3997e737ef7ec689d391c1c71c6837eb3309d5fded5c0268532bdb719		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 12616 bytes

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