Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15a496b9e385f11…

MALICIOUS

PDF

93.9 KB Created: 2021-04-15 22:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8a68576583087d8dab44a42d0fec3698 SHA-1: 1b1dce71f27421f927993ba34edcf5a5ccb62852 SHA-256: b15a496b9e385f1121d2dcf31d138137e9f0d2931da69ebeb94f5c1df75caa85
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=irender+nxt+for+sketchup+2015+crack+free+download PDF link annotation
    • https://kenibuxe.weebly.com/uploads/1/3/4/6/134688639/tokopipidamalixil.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/davuzimawojudonimifevesocoy78.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/duxonimolutewere.pdfIn PDF document text
    • http://raisinshub.club/kunevuwiropabamekajronu.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/pikisedi-vesaw-luwep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_604339362c51a.pdfIn PDF document text
    • https://jukikekiku.weebly.com/uploads/1/3/1/4/131453151/989c3d3bc.pdfIn PDF document text
    • http://subbellassecret.com/27695418437pw3yh.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/2c19fe8193b.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/977567.pdfIn PDF document text
    • https://kuzeloxowew.weebly.com/uploads/1/3/4/3/134330257/tamuxenoled_xizukal_musagapafuwoz_depatarezo.pdfIn PDF document text
    • http://ctyr.ru/amplificateur_oprationnel_comparateurwhli2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_6032b135b0dc0.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/bb55113e-10f8-4cdc-87fa-ca3c85567633/mamiya_c330_original_price.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/mr_coffee_espresso_machine_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/puvamekerenata.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/rukawosirubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a73aed8-2c61-4ff9-af73-7dd6687132fb/mathematical_statistics_with_resampling_and_r_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea91cf13-07a6-48f7-8f46-20f541a4d4c3/10673521264.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/dioses_de_la_mitologia_griega_personajes_principales.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_off00012feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEB 5856 bytes
SHA-256: 658309e9b41742597bc20f0b8a6b83bc35a854cb276926bc08da614bcb8b7515
font_01_sfnt_off00014400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14400 11212 bytes
SHA-256: 5f28789f9e3f84d55c1b3d1c0fa8b261df0b6c460cf218a22a53e89b2f3f28a2

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