Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bdf9dac5ffee2ed…

MALICIOUS

PDF

72.9 KB Created: 2021-03-02 15:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c8ec23e184584f3a2a185249b227434e SHA-1: 6cd7eb3a28462fb8a67a7a315e19db41d369ee0c SHA-256: 7bdf9dac5ffee2edc498efe16ea94087845c544e8c5616a8f2d2ba609ef14623
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-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://vilenefex.ru/strik?utm_term=how+to+check+voicemail+on+lg+flip+phone PDF link annotation
    • https://bofubesal.weebly.com/uploads/1/3/5/9/135958810/filuxakox.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/english_grammar_book_2020.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/48143806958.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/nazufipatob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483335/normal_60032effdd615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_6024055ce5d0f.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/what_is_100_step.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365626/normal_5fecbc3e609af.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/zikeko/65714239130.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/what_are_examples_of_evil.pdfIn PDF document text
    • http://romukebiguvux.rf.gd/sinamijezimi.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/guide_classes_wow.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/pc8_application_form_australian_passport.pdfIn PDF document text
    • http://kesolimasakifi.myartsonline.com/xonojeniluni.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_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 5332 bytes
SHA-256: aabce0dc554f7709079b706f0bebb23cb30105b36ccf6c5e8e4d677a653931e7
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 10500 bytes
SHA-256: 91bc64d11456871e4c45cb4944fcb693681c347868e9b5e7579c373c2567f032