Malicious PDF — malware analysis report

Static analysis result for SHA-256 188f87515d72e64d…

MALICIOUS

PDF

99.0 KB Created: 2021-02-19 01:19:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 98756e74a9d893dd777c5ece4c666dee SHA-1: 912e108a81dd5caac8ec6b9822b0e4d406fe527f SHA-256: 188f87515d72e64d25d60c29f83ac52e4abd11c67e108ab1fb6a6af2d73a7d77
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9997

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://leonvi.ru/strik?utm_term=is+dyson+a+private+limited+company PDF link annotation
    • https://delidanazej.weebly.com/uploads/1/3/2/6/132681463/venigufidofa.pdfIn PDF document text
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/xenafotojode.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/ifwQCMk/labubadezuwamunolivekab.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/xixiweponew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365638/normal_5ff810a976956.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/450233.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/ShaagfP/zivirazadimomabe.pdfIn PDF document text
    • https://domemasajexal.weebly.com/uploads/1/3/5/3/135304114/fuzepimiwasozupu.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/i8qghLG/noxoxiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476275/normal_5fe8ff55509ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458848/normal_60224b11bf01c.pdfIn PDF document text
    • http://strgb2.ru/nivovufodashoy2.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ifhfhif/rilivaxifakizuku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sogisujomixugo.epizy.com/dmv_driving_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/yowhatsapp_terbaru_2019_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/aaru_paranju_malayalam_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/68680492854.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/corporate_charter_approval_sheet_maryland.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/bandos_guide_alora.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001353e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353E 5108 bytes
SHA-256: b25883cc0e6c959593523e548b8953408a1ece10a62100a323d709a42139737b
font_01_sfnt_off00014687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14687 11868 bytes
SHA-256: 4a9e51c34356708b0c35ba26126fce76f75caf074578c53376cb1845c59cd322
font_02_sfnt_off00016e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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