Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f1903f9c57c90c…

MALICIOUS

PDF

76.9 KB Created: 2021-06-03 09:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 244efce1107f3657f06cfe920d52a1b1 SHA-1: 70d7dcfc0f1d8c7f21a39c01a620820228b30523 SHA-256: 23f1903f9c57c90cb214028f9c59cedb5b2ef88d9bbabacdfacbf1366eea6f54
186 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 0.9999

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://krisoc.ru/pbw?utm_term=hifiman+re+400+review PDF link annotation
    • https://tutamakut.weebly.com/uploads/1/3/0/7/130776204/f2f68c33e2f.pdfIn PDF document text
    • https://geripipo.weebly.com/uploads/1/3/4/3/134371036/689dd13a0.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/3c2751f7-5aa7-4437-9960-dcb1d6f25b31/how_to_sterilize_spectra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a19b08-2e01-4c0e-b67c-a70109597ad2/kataxotomojutolez.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144412725/watch_spider_man_far_from_home_free_stream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e8a0384-470b-4bc1-96cd-c8e3eafce5fa/jezorudunajedesokipasular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72bc3ac5-15b0-4e2b-95cb-f2451dc51dfb/winchester_gun_safe_26-gun_capacity_ts26-45_review.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/w/file/fetch/144513963/tatigadasujutixokax.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/f/pros_and_cons_of_tax_relief.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94563fb4-aaf5-42fe-a3cb-30f50daad973/pikos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09669dd-ddcb-4e3c-b403-e4ee79575b43/wuzewaxugodadove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d698ace4-2354-4448-880f-d3e1e0b544ed/roxewemosadawovosoz.pdfIn PDF document text
    • http://wusagem.pbworks.com/w/file/fetch/144447453/como_sacar_nmeros_de_oxidacion.pdfIn PDF document text
    • http://sujagajo.pbworks.com/w/file/fetch/144530043/47263273970.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/what_is_the_best_free_anatomy_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3f0a39-5a12-4516-8549-92d5e9149f38/how_do_i_search_the_dawes_rolls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72e7c02-a58f-4697-9ad8-47e9f65f3695/11775448218.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/abstract_reasoning_sample_test_with_answers.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_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 5048 bytes
SHA-256: d0797ff18c315f361c76bf592da416159e1e364b43c3610b4d81522a19da4001
font_01_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 11276 bytes
SHA-256: 2cc9c7b3422508048d49fe4365ed74a9d2560fa1aa11307689a3cd78e5b6d4e1

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