Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba577677c5c0b5ea…

MALICIOUS

PDF

73.5 KB Created: 2020-12-11 15:14:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d827b1d44db336f1e28c6f1d9947938f SHA-1: 9c8b0a56679a465f3a97684e72e3ef45f9fd3a08 SHA-256: ba577677c5c0b5eab1c47f877cd2c1675f0cf81f9323b0775a88165238e3fce8
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 0.9998

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://trafffi.ru/123?utm_term=random+fortnite+account+generator PDF link annotation
    • https://jujepuwajepoxox.weebly.com/uploads/1/3/4/4/134466337/9f6bb.pdfIn PDF document text
    • https://vadiwolor.weebly.com/uploads/1/3/4/7/134737839/rewateziwo.pdfIn PDF document text
    • https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/kukijimiziko.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/wedanixolek.pdfIn PDF document text
    • https://bizidijekivaza.weebly.com/uploads/1/3/4/5/134502856/remotupivimolasuvuj.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/15062b9a-e9e7-41c9-b94e-49bf941135d2/eve_online_isk_guide_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc52776e2fce462bca78837/t/5fce17220ab5d62feb1a3fd5/1607341858980/toy_crush_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/47780105149.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/beginner_level_english_lessons.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/asu_calendar_2020_21.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/fekudap.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/jiwivapubimifalilefev.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/school_design_concept_architecture.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/kebifisesaguxapuvanuwakax.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_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 5136 bytes
SHA-256: c264b04ac19bb548e12fade2a88ccba6493b95ac916126dc46240f9a57d68422
font_01_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 10304 bytes
SHA-256: 434a1077c538404021f10f178f44554103a0bda9fefe571776480e330d1a6f0b

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