Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6cea7aa2846d01…

MALICIOUS

PDF

66.8 KB Created: 2021-03-01 22:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8a3c7833599fad6080e69e61ee4ec818 SHA-1: baf13a33d9d43307ec4c7dde14157ff27a83dab8 SHA-256: bd6cea7aa2846d016164374eddbadb9844f6fd6525871dc626f96fb800632794
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or redirection scheme. The primary lure appears to be 'Como criar um logotipo gratuito' (How to create a free logo), which is likely a pretext to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/123?utm_term=como+criar+um+logotipo+gratuito PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5fde13ed41718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_602cdf027208d.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/fqhcImb/kusof.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/kejanixi-tolunawu-kudipekusu-wonikaxari.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/ifiaghe/21159963876.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/ijvigBI/manager_tools_disc.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/tifowedibe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475572/normal_5ff4f3b6be471.pdfIn PDF document text
    • http://itanto.space/39014585698mjhcu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_60219444b16fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_602a226835d3e.pdfIn PDF document text
    • https://kivinogafuwej.weebly.com/uploads/1/3/4/7/134702495/repejurutupisewuj.pdfIn PDF document text
    • http://knitfqph.site/zemed2ihj1.pdfIn PDF document text
    • https://cdn.sqhk.co/bamopilu/0gg3ihn/international_business_law_news_articles.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/lhfVHjb/zombie_diary_2_evolution_mod_apk_revdl.pdfIn PDF document text
    • https://kowenijog.weebly.com/uploads/1/3/4/0/134096242/6815543.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/fjfgggi/high_temperature_cooking_oil_for_grill.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 4980 bytes
SHA-256: 5a63d4ee03a65795ae3271f5b8557fe22ef93040544bdbb4867f3ba723d6cba0
font_01_sfnt_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 11540 bytes
SHA-256: abc85c2106131bd8d17a3c1c0f999fc427b6ff42ff30ae157b0733ce6f42a935

Open this report in the interactive analyzer, or submit your own file for analysis.