Malicious PDF — malware analysis report

Static analysis result for SHA-256 b100043514a16fd6…

MALICIOUS

PDF

73.9 KB Created: 2021-02-20 07:47:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ecc6047102191910f8fea9433067243e SHA-1: 95890a43de343dde20643b4613faa57be7f0f0b0 SHA-256: b100043514a16fd6f52aeb7a686348e293d8a3b2466134dd2b89ebe53a2e2823
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-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://baarspo.ru/wix?keyword=ct+driver%2527s+manual+2019 PDF link annotation
    • http://begemotiks.fun/806982323783k8zk.pdfIn PDF document text
    • http://xakojudanek.66ghz.com/best_logo_design_software_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_601b88db821b3.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/OifYidr/strategic_management_textbook_mcgraw_hill.pdfIn PDF document text
    • http://nikecortez.net/71708477440nvmgp.pdfIn PDF document text
    • http://ecoservice-vlad.ru/96092815777g55r4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_6028066f2196e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5ff08a8b4cc23.pdfIn PDF document text
    • http://donbetosstreettacos.com/dungeon_pixel_pcdlj1j.pdfIn PDF document text
    • https://cdn.sqhk.co/mapibeze/bggY6hg/89713768756.pdfIn PDF document text
    • http://steblin.pro/5741656440389zwp.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/a1gehhH/tower_defense_kongregate_kingdom_rush.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/dscjja0/new_ringtone_2020_love_new.pdfIn PDF document text
    • http://emmetrix.net/adiabatic_demagnetisationlokr6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zebofazedixa.rf.gd/pukas.pdfIn PDF document text
    • http://xafamikipu.epizy.com/35155652292.pdfIn PDF document text
    • http://kinutumuzikuji.epizy.com/why_is_whirlpool_fridge_not_making_ice.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 5452 bytes
SHA-256: 58a5f79800d3f7af3af7acfde6607db984623023eff60a5bc2c3cba9d6ce84b7
font_01_sfnt_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 10376 bytes
SHA-256: d6631b4528e2af3b327b13e874ef9c5a10cbb8ba462ce1fd28cedc90a723b08f
font_02_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 16208 bytes
SHA-256: f76e53b1165c770ea72ceccb5e808e1d48d2b426d0b5e274530350a00bad707e

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