Malicious PDF — malware analysis report

Static analysis result for SHA-256 87492c2fd5678473…

MALICIOUS

PDF

85.0 KB Created: 2021-03-23 17:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5878e8dcf95a3e2652a8bed02efe7f64 SHA-1: 5adc51d1d7c297fee4feac999384af2564f13bfc SHA-256: 87492c2fd5678473503b3aa51818358442561bc1f557226ddca2b1af26750c10
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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.
  • 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://xezojetit.ru/strik?utm_term=does+hbr+exhibit+hydrogen+bonding PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499999/normal_5fcd12b01a908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_602edeea79213.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390350/normal_6008b7aa34a70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460450/normal_5ffe42464f06d.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/honda_cb_shine_spare_parts_catalogue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_601322f11c1c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402280/normal_600342855b1d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_f09275375e3846239672e5bbc756a20b.pdf?index=trueIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_00d68f968eae4e7c817bfbedd3652819.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/klasifikasi_cacing_tanah_menurut_ekologi.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/kaplan_statistical_modeling_a_fresh_approach.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/how_to_use_a_rice_cooker_zojirushi.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_ccb8af84e0714fb89659d00e40eed2bb.pdf?index=trueIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_8e632ecb36c74c378fe69095c8990351.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_091aa06890d84ab4af6c9a6fd6b29c39.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wozoxub/aluminum_alloy_rolled_sheet.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_409c5767fc8440c0bfc807448b2dc4aa.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 5156 bytes
SHA-256: a3721e6452e60ec19e0abd40300d144dd1970430c434e75c61d77f9825a0bab2
font_01_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 11152 bytes
SHA-256: e7c200579a97b0c2b1f38bd38158e4cb15c9ba4e55083072327ac51d4a439264
font_02_sfnt_off000131c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C9 16084 bytes
SHA-256: d657604601c07a6cf666dc8a00d19994aa5efb5edd91eeca27759d64a9703145

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