Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8eb5bad7e08d73…

MALICIOUS

PDF

85.5 KB Created: 2021-05-30 07:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 19bf29e01aa389f32c1b7cbc12a1359d SHA-1: 11b4d601e0ce2f66099ece3230111982f4415e46 SHA-256: 3c8eb5bad7e08d7364b569133d51b8d5099de219eff568ae4f67b07d8c9d76e6
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 0.9991

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://soxebez.ru/strik?utm_term=block+diagram+reduction+technique+solved+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377909/normal_602872503ba7c.pdfIn PDF document text
    • https://xexogabowagub.weebly.com/uploads/1/3/4/4/134438270/85ea7256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_5fd646886dfc6.pdfIn PDF document text
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/didonezewepo-bovoxu-gevowanuligo.pdfIn PDF document text
    • https://zapufotipo.weebly.com/uploads/1/3/2/7/132740892/sexumiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_605f42cea320f.pdfIn PDF document text
    • https://loxojugeg.weebly.com/uploads/1/3/4/5/134589710/962c9f70f.pdfIn PDF document text
    • https://pasiwuguvode.weebly.com/uploads/1/3/4/6/134601834/770362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5fd18560b7fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_605d8c6045e6a.pdfIn PDF document text
    • https://jotopivazujofid.weebly.com/uploads/1/3/4/8/134881135/fejavedavebegimuzud.pdfIn PDF document text
    • https://pimimazeso.weebly.com/uploads/1/3/4/5/134523822/fozasonegudoguw-mikorifat-liketoso-zawinebuladu.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://uploads.strikinglycdn.com/files/6b1614cb-da74-4787-a3e7-66bd3f07330e/digitech_vocal_300_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17f3324-ea9b-449b-ab7a-891bdcc4808c/18244656918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b069af6-62c3-43e5-8399-0960fbfbd180/92812662762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/817723f3-648f-4d09-ae50-efee7b409870/zibezuwonaluxateve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9880bb38-32e0-456a-84f4-2b58c2df95bd/bushnell_impulse_cellular_trail_game_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04d24a0-5ee4-4f7b-bcfb-ebbe8e762520/worelidipusiwimabawanuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3b8b82-0ba6-414c-aebb-7b9954be09b3/financial_plan_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e71f6c-ddeb-4cfb-b9a6-a9e5e1387c07/1861968962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa0a110-497b-4a86-8277-4edcde5dc834/xuvotinotapibozirizadak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ddb6d4-6d7f-4ba4-a3d5-656ee4005c99/pivujur.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 5736 bytes
SHA-256: d93ccb88a5887e6e8c420cdb33ab98a2cbd39fb0b9f74027a09f4e9af5aca364
font_01_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 11468 bytes
SHA-256: d6e6090b8c7daea3bbbf1464f77dec1ba798ffec9500277f62c8d49bae804a43
font_02_sfnt_off0001255c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255C 16068 bytes
SHA-256: 2e6efdb6ec6b06881b73571a6dc11127da1b4fc0f11d045bd7c2e12cbfc92ea6
font_03_sfnt_off000139f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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