Malicious PDF — malware analysis report

Static analysis result for SHA-256 300b5e1953727f77…

MALICIOUS

PDF

78.6 KB Created: 2021-04-04 01:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5f4556a33ef98e5a233c0f251c267a58 SHA-1: a8a6a013e2a8fc9bb90465e354af607a2b9c37ac SHA-256: 300b5e1953727f77fa4437b1989a7e374e2ecccb7d61240de59e482b5ecd327b
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/strik?utm_term=lista+de+verbos+irregulares+en+aleman+conjugados+pdf PDF link annotation
    • http://xilibinebosapeg.mywebcommunity.org/48675065936.pdfIn PDF document text
    • http://moxilekulina.getenjoyment.net/64371569615.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/hypertension_guideline_esc0fijd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_605da1f09a82d.pdfIn PDF document text
    • http://akfb.online/does_ut_austin_look_at_weighted_or_unweighted_gpathrfu.pdfIn PDF document text
    • http://reform-st.ru/lowilumawadezeriboxaxorip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_6010acdf31eb9.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/regukolugosup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_6011edb33fb6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_5fe6a586e4e09.pdfIn PDF document text
    • http://winnerslm.space/laxemodbo3o.pdfIn PDF document text
    • http://gomigapujasep.sportsontheweb.net/listeriosis_outbreak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca87ca5-2939-471f-ab0d-259b80ec718b/64690693199.pdfIn PDF document text
    • http://nawonarubital.epizy.com/jisonigidinoxizomonezi.pdfIn PDF document text
    • http://fajubumejuxuful.rf.gd/what_does_knowledge_based_economy_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6e65ef-bf39-4099-84ec-68d3cd543e96/jugezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae804438-4dec-49cc-a54b-f84ca1b62881/2018_sea_doo_spark_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d95d8fb-0322-4d5a-9920-17ce7d411470/where_is_the_wps_button_on_my_new_sky_router.pdfIn PDF document text
    • http://rugeritubaduw.epizy.com/diparaxud.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_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 5692 bytes
SHA-256: f3c7cc3fc294ba4abb7022b4d7c9740dd89f7203a8b7407c3e6fabcad8e36361
font_01_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 13180 bytes
SHA-256: 1f2d652485abccb3874b3971832b47284121a4423326a8a54e539059e9beb3ac

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