Malicious PDF — malware analysis report

Static analysis result for SHA-256 7523f25d867b40f9…

MALICIOUS

PDF

75.8 KB Created: 2021-02-26 19:14:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ed943a3c00de8305513db4647a1161a0 SHA-1: 51ba2a5b0d76e722e7c303f7eabdbbd9b8540857 SHA-256: 7523f25d867b40f9a97cab0f2e8063ad42cd0b7314b8ead06d1bd8197b5b1774
196 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 0.9998

Heuristics 6

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://zajinet.ru/strik?utm_term=what+are+the+advantages%252Fdisadvantages+of+capitalism PDF link annotation
    • http://tameenegypt.com/basic_english_grammar_for_class_2wdxjr.pdfIn PDF document text
    • https://wemogutidagumov.weebly.com/uploads/1/3/4/6/134669151/4805599.pdfIn PDF document text
    • http://s7hmus.org/nexajibazonutigozewazasuppzyf.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/womuvelizev_kunenunovubi_kovozirasapa_vajowis.pdfIn PDF document text
    • https://zixudepapu.weebly.com/uploads/1/3/2/3/132303172/d9e21b28b5db.pdfIn PDF document text
    • https://kibodoru.weebly.com/uploads/1/3/2/6/132695707/6a936387aa8cf1.pdfIn PDF document text
    • https://libotavod.weebly.com/uploads/1/3/0/8/130813055/paferidokepesomu.pdfIn PDF document text
    • https://cdn.sqhk.co/radageroboko/jgDvhzR/ketujimaberido.pdfIn PDF document text
    • https://cdn.sqhk.co/mozigizax/fdijgeW/92174923481.pdfIn PDF document text
    • http://managerprogram.live/dead_space_mobile_1._2._0_apkgtbay.pdfIn PDF document text
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/turenofirozapaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/gAShgjb/kart_racer_game_review.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/bogeguva/how_to_put_in_rpwfe_water_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/clothing_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/hipaa_privacy_training_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/how_to_analyze_aggregate_report_in_jmeter.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/marketing_mix_process.pdfIn PDF document text
    • http://tekubone.epizy.com/lady_bird_johnson_grove_trail_guide.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_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 5676 bytes
SHA-256: 509340c1093b4264666496d9480994ab36c496ea4176bc267522c7dc6224554b
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 10660 bytes
SHA-256: b7dd50902aaebdcbb5945ff41c9c2f8962ff7c5ccbace25c50fc64a2762532c4

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