Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4aa8423e12ff8b3…

MALICIOUS

PDF

88.5 KB Created: 2021-02-27 20:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ec929d695b761e7d06625847cb528b0e SHA-1: 5aa31aa0576164af2e46f3bda11d27581e027a4c SHA-256: f4aa8423e12ff8b33b8b8a8c4d703a310b5816732cf16f7307387a14e4e20e47
156 Risk Score

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 0.9997

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://druttle.ru/wix?keyword=opticover+wifi+extender+setup+instructions PDF link annotation
    • http://gisoboxizaza.mygamesonline.org/numetowipazofavadejemegax.pdfIn PDF document text
    • http://miwodenexiz.iblogger.org/kodolivu.pdfIn PDF document text
    • https://nowatipuzovatob.weebly.com/uploads/1/3/5/3/135397830/selejotowupub_fototusu_xabozitirixud_nexugizerod.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/baby_boy_gap_sale_uk.pdfIn PDF document text
    • https://ritajixudigozik.weebly.com/uploads/1/3/5/3/135345652/metokomutosatakiweza.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/wuvisegena.pdfIn PDF document text
    • http://bobejitamatu.iblogger.org/64883801270.pdfIn PDF document text
    • http://copyrightproblem.com/67562027527cri1e.pdfIn PDF document text
    • http://efarbok.xyz/xovesokarodufuvomikezaxegp57z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/mathematics_8th_grade_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/best_performing_facebook_ads_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/30534241515.pdfIn PDF document text
    • http://bigokadurobogaz.rf.gd/fractions_worksheets_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/67279014069.pdfIn PDF document text
    • http://wupubobetob.epizy.com/digunalobudif.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_off000113e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 3028 bytes
SHA-256: 6cfa60dc40586b42c068701d589185798e431e94df5ff33a244e21b196eaa688
font_01_sfnt_off00011eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 5152 bytes
SHA-256: a0125c16c142e4357336058bd50113ff63d53603ae8da8c5278b53fcf41690b5
font_02_sfnt_off00013063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13063 10644 bytes
SHA-256: 8fa57fb944b8a1c83a99dbf0a76bc74ada3426611538a6af31a42258dbcb86de

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