Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4771422a9170ec7…

MALICIOUS

PDF

91.1 KB Created: 2021-03-16 08:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f3cc96d62c67e93d140897f358ef7dc9 SHA-1: 53d3871b133714b28e176c809f655bdc10fd14a3 SHA-256: b4771422a9170ec769319d17ae91635ab80454b82b5eda67bec33ce41cf0a293
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 0.9961

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://nipisod.ru/123?utm_term=promissory+note+template+virginia PDF link annotation
    • https://cdn.sqhk.co/movozuba/iBTjcfe/80246646159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_604f1b011e8bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486221/normal_5ff86656d5413.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/ghcyjcI/auto_followers_for_instagram_app_download.pdfIn PDF document text
    • http://safanuzimu.22web.org/cabra_cabriola_turma_da_monica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_6010a994d6225.pdfIn PDF document text
    • https://cdn.sqhk.co/logenuzupug/bv4g7dF/61161004772.pdfIn PDF document text
    • http://deluwotitawugo.iblogger.org/wirubunoxalenukelizunij.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/gehj9Aj/mac_magic_mouse_charging_time.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_603ede0422e69.pdfIn PDF document text
    • https://cdn.sqhk.co/vibesadebo/hiiaZjg/lugedegibuwibaxitimidaboz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_207f101d43e049d59be9ff0a26f4bcf8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/place_value_anchor_chart_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/71769696686.pdfIn PDF document text
    • http://bajivuselome.epizy.com/feluvonidobeniboluj.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/79410331654.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_eb7c4217e71b44919669eef4c35ddc74.pdf?index=trueIn PDF document text
    • http://jexalokilefel.rf.gd/data_structures_and_algorithm_lecture_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/air_cooled_911_performance_parts.pdfIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_fa699d35c8bf4f9b8a71f35c6e24b7b4.pdf?index=trueIn PDF document text
    • http://guruwemuzotal.epizy.com/riwatoposukodomurezu.pdfIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_6a6673e805ac4c4db918696ee5052644.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lososimap/lunazewifaderefu.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/88566165007.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/1155438296.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/akademia_pana_kleksa_nuty.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12346 5300 bytes
SHA-256: ca05fa96335cb8e0f14a074f9fbc226ffdaacd31ebfc536d8f6a6562405ec055
font_01_sfnt_off0001354a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354A 11764 bytes
SHA-256: ce62f80f768ee3fdbbd4f7b079f34e60dd139ece299c884c0e3269851dfd381c

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