Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec81e6e284304e5…

MALICIOUS

PDF

74.0 KB Created: 2021-02-03 00:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0b229c927a4eb15540cf65d567367b48 SHA-1: abae14d07519bb2c9989f9c8fefe5f896ce7b58e SHA-256: 5ec81e6e284304e5950a9ef39163fc981749132ca5d7e5d413805c0e6193203c
126 Risk Score

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-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://jottigo.ru/aws?utm_term=baba+bandook+song+lyrics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379970/normal_600291419a903.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/qOrjihf/funaruwudavi.pdfIn PDF document text
    • http://dorightunion.com/61285971873xwkhq.pdfIn PDF document text
    • http://dunizajo.66ghz.com/79144855397.pdfIn PDF document text
    • http://best-ital.fun/382950886928gozr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_5fd80668693a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388611/normal_5ffb84323cbb6.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/FhgUhc9/28430964297.pdfIn PDF document text
    • http://grantmedica.ru/16323878821rf9az.pdfIn PDF document text
    • http://kyponnik.online/best_classic_cafe_racer_bikes152qn.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/rubank_elementary_method_clarinet_pdqo5qp.pdfIn PDF document text
    • http://yazansoft.com/bob_the_robber_4_japan_hackedq888h.pdfIn PDF document text
    • http://fitit.space/png_background_full_hd_freecekag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_5fd67dd1bde45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabowedufup.epizy.com/awash_national_park_travel_guide.pdfIn PDF document text
    • http://kivekedifewu.rf.gd/ponakewiluda.pdfIn PDF document text
    • http://vuzabog.epizy.com/gelozuvinufotezapelevofa.pdfIn PDF document text
    • http://xibubew.epizy.com/free_act_reading_practice_test.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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 5464 bytes
SHA-256: 290b8bde5154a9c60920632c8c1f4dd7ac38943a31865ccbc99fe07af02bfdca
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 10912 bytes
SHA-256: c82dbbd7547bfdf628e4a62672b3e13383fdfe9239c264d7382b98ecf584f703