Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd9fe886e63cd28…

MALICIOUS

PDF

75.1 KB Created: 2021-03-26 19:25:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5ae7a32dd6bef862dc0d77cde54ecc04 SHA-1: 5705e76b2cf435e518a33e51033815aba2ea72de SHA-256: 4bd9fe886e63cd281ca308c78a9a71d73f60ee2ee2ce997c6b0510d94578e6ba
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 0.9991

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://pelibifir.ru/123?utm_term=carbohydrate+research+guide+for+authors PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446016/normal_6035bc73c221a.pdfIn PDF document text
    • http://xazoxaruxilovo.iblogger.org/nanexugi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408464/normal_600057ad59395.pdfIn PDF document text
    • http://zodezabazigojab.iblogger.org/causas_de_anemia_normocitica_hipocromica.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455207/normal_5ff3aba929881.pdfIn PDF document text
    • https://novazoneb.weebly.com/uploads/1/3/0/8/130814043/8227193.pdfIn PDF document text
    • https://kixifosesezor.weebly.com/uploads/1/3/3/9/133998007/balipozejabopojed.pdfIn PDF document text
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/337511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376610/normal_5fccd5ae66542.pdfIn PDF document text
    • https://mamumudud.weebly.com/uploads/1/3/0/8/130814078/dorejewidamo.pdfIn PDF document text
    • http://wabizuvo.iblogger.org/etica_para_amador_capitulo_4.pdfIn PDF document text
    • https://lobekopaxukibo.weebly.com/uploads/1/3/1/4/131453735/d3840880ccd24f.pdfIn PDF document text
    • https://nadaxujapowa.weebly.com/uploads/1/3/4/8/134891343/2807861.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/valujetedizepigokew.pdfIn PDF document text
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/patelaluped.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_6025a62748098.pdfIn PDF document text
    • https://jumaredutidab.weebly.com/uploads/1/3/4/3/134310232/povebunaxuzu-bikanepe-lidezunujonufi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gozifep/rumufurutisosorog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f11d173a-52b0-4548-87a5-d4581f621ac8/63378290853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630afc0f-3aae-486a-a658-696c9b24c4af/can_i_get_a_new_battery_for_a_kindle_fire.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/32989558761.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/tikokijobizu.pdfIn PDF document text
    • http://raselitabak.epizy.com/35754682426.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/takofim.pdfIn PDF document text
    • http://zimofizamar.epizy.com/xowavoparu.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_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 5396 bytes
SHA-256: ff2f0735e6769107c24db97be611faf7314e95e62e35177a42eb7cfeff1c3391
font_01_sfnt_off0000f909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF909 11236 bytes
SHA-256: f394a479c3ea499a9602ad644b9734ddb8989fd8a424a5a37f30ce9a161e82ee

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