Malicious PDF — malware analysis report

Static analysis result for SHA-256 e435679aeab4724f…

MALICIOUS

PDF

106.1 KB Created: 2021-03-04 02:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5c68298bc2be8866b20e0ddf60867c3e SHA-1: 90a63e29455c481b07a7393fb2d4b9f581ceaa46 SHA-256: e435679aeab4724f2fbf163bf1485ffcee6f7391ec0f5ca74df23bde1d5935da
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 0.9997

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://soxebez.ru/wix?keyword=chevy+cavalier+manual PDF link annotation
    • http://trickyturkey.com/xobogalavujakimopurunokdcb5h.pdfIn PDF document text
    • http://elinekici.online/danone_integrated_annual_report_2017raavz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458854/normal_5ff84ca0b034d.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/why_do_wires_carrying_current_in_the_same_direction_attract.pdfIn PDF document text
    • http://copyrightmediahelp.com/bekukaxopujezusamuleravvuhkp.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/hijh9jj/gejelobenerutolotut.pdfIn PDF document text
    • http://fosonelotila.medianewsonline.com/how_to_set_up_a_project_management_office.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_601d217782433.pdfIn PDF document text
    • http://mavafesumej.medianewsonline.com/siwekefakupawif.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/posogadolisu.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/fabuwepalisasun.pdfIn PDF document text
    • https://cdn.sqhk.co/rinilafexowi/hapWCep/96701213535.pdfIn PDF document text
    • http://es50off.pro/82304230693kzxti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_6012384ba7b3b.pdfIn PDF document text
    • http://detonic-de.website/wemaxj7nxp.pdfIn PDF document text
    • http://dlkmvkoenv.info/white_rodgers_thermostat_1f78_installationv4ha9.pdfIn PDF document text
    • http://pasetbs.xyz/graphic_novel_template_panelsfk8dm.pdfIn PDF document text
    • https://cdn.sqhk.co/dukasavubu/gdhhM1G/whispering_oaks_rv_park_weimar.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/authors_purpose_pie_anchor_chart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nojikigor.myartsonline.com/find_the_centroid_of_the_shaded_region_measurements_are_in_inches.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_off00016638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16638 4928 bytes
SHA-256: c5143fd01d7c929424ef86307b847ca474de68d7783ee1f819fcfc514dfc1d42
font_01_sfnt_off000176d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D7 10640 bytes
SHA-256: f2290f808346828239f79f51a21e61dfb466dc5fec196dd0532cb6341c728ad6

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