Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe3f2fb82b8b256…

MALICIOUS

PDF

85.6 KB Created: 2021-05-22 18:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 21c370c35065a7ed8dc772ccdaa6c5b6 SHA-1: 900cb298ec446c7fd2747c50cdd8b21ede88ed7a SHA-256: 5fe3f2fb82b8b2565af90cfafc82aa3d0ea44aa0f971680caa1aa0571be2a90d
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 0.9995

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 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://jottigo.ru/strik?utm_term=construction+work+in+progress+template+excel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450507/normal_606d9a0a67b6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367268/normal_5ff283f8943fd.pdfIn PDF document text
    • https://kozenuxifojani.weebly.com/uploads/1/3/4/6/134665776/9576866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418185/normal_5fc89b6eaf895.pdfIn PDF document text
    • https://govoxarenaja.weebly.com/uploads/1/3/4/8/134874143/3660393.pdfIn PDF document text
    • https://zanomegujinax.weebly.com/uploads/1/3/4/8/134873542/b39ef916.pdfIn PDF document text
    • https://dojebuxepoviguf.weebly.com/uploads/1/3/1/4/131407435/c2af05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_604914c3ca8f3.pdfIn PDF document text
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/3268326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425908/normal_606368850707c.pdfIn PDF document text
    • https://xojozojejaxito.weebly.com/uploads/1/3/4/8/134866115/1ca4fa.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/3882348.pdfIn PDF document text
    • https://naxovemunozi.weebly.com/uploads/1/3/5/9/135958864/lagavojuj_fumek_kizunexiverajo_juvogepunuzef.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/f11bec10-ffa1-4cd3-aaeb-4aa4b42375fa/dark_souls_3_dex_build_rings.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/oxford_academic_dictionary_apk_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/cuanto_equivale_1_4_de_pulgada_en_milimetros.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/45734980286.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/71926632461.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/how_do_you_know_if_a_record_player_needle_is_bad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e91868-d339-490c-87b6-1103e520966c/systemverilog_interface_in_package.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/35819911801.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/62354884592.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_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 5384 bytes
SHA-256: 1f23d3a6f750fa6e6f8ec6a498247a24a483018670a888bb38f12ea7e8a54652
font_01_sfnt_off00012581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12581 10252 bytes
SHA-256: 05e86d4d7df1a27a33f63343e0a7450f86daf7e8c8105dd92027ac91dd29521e

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