Malicious PDF — malware analysis report

Static analysis result for SHA-256 18581d8dab36ac3d…

MALICIOUS

PDF

82.7 KB Created: 2021-03-03 17:40:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1e7056b2ea6330435455cf6a12f2b035 SHA-1: 47ff4494bcba775692ad34895e541e96e6395fcf SHA-256: 18581d8dab36ac3df9bf8cc6d3a0c641bd541e3b1ccd344209d3a079dd588f60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with the primary suspicious URL being https://jottigo.ru/strik. This heuristic, combined with ClamAV detection and ML classification, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to redirect users to compromised or malicious sites.

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://jottigo.ru/strik?utm_term=what+was+draco%2527s+task+in+half+blood+prince PDF link annotation
    • http://zawugudumi.getenjoyment.net/buy_norton_psychology_reader.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/what_is_nuclear_fusion_in_physics.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/siwikejorukiw.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/gumidifezogexe.pdfIn PDF document text
    • https://rutedidatares.weebly.com/uploads/1/3/4/4/134490949/5d398.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
    • https://s3.amazonaws.com/guwutivupudutu/school_uniforms_aurora_ontario.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/34532367691.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/digemigosopadifamuxubija.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/comprehensive_medical_report_example.pdfIn PDF document text
    • http://mugazukadum.onlinewebshop.net/game_of_thrones_episode_5_recap_season_1.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/champakulam_thachan_malayalam_movie_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/wedding_march_mendelssohn_organ.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/cgp_biology_a_level_revision_guide_ocr.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/digitech_jamman_express_power_supply.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/awesome_mix_vol_2_songs.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_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 5372 bytes
SHA-256: 5bbbc2738468a39c62b7b664cba0c14a423fe911e3477bca8ef3fea8f7a53abf
font_01_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 10544 bytes
SHA-256: 4d298699d29432d599a29d75833bf0968c6b93568e22e7b99df23372f29d104f
font_02_sfnt_off00012d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D67 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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