Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af592a5be2892d5…

MALICIOUS

PDF

60.6 KB Created: 2020-11-06 10:47:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e867c28d7f82e318e0e48200dfe68126 SHA-1: 4baf2c0766b135e9ff54cdd322016e92d0275eb8 SHA-256: 3af592a5be2892d51d06db656fe17d0ef92c4ff12f4b1a8fb51e98037852ae0e
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. The embedded URL 'https://traffking.ru/strik?keyword=vectors+addition+worksheets' suggests a lure to a website that may host malicious content or further redirects. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffking.ru/strik?keyword=vectors+addition+worksheets PDF link annotation
    • https://fasefipuronupa.weebly.com/uploads/1/3/4/4/134471496/zomemujojapose.pdfIn PDF document text
    • https://nafeziwubiwodi.weebly.com/uploads/1/3/1/3/131379183/zudijosodasoguden.pdfIn PDF document text
    • https://pojozuwowate.weebly.com/uploads/1/3/4/6/134631913/add3f3782b7999.pdfIn PDF document text
    • https://bazotopefinuz.weebly.com/uploads/1/3/4/4/134435952/bajipimigise.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/235345d5-1532-4d96-90a8-2d790956324e/mosefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b950c74-bdd1-409d-8d5c-1b21aef2da90/44598959726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7dfdac3-1ff5-4fc2-84ae-aa0f91ca0410/o_guia_do_mochileiro_das_galxias_resumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858969db-736d-427a-8a97-0f7a1a5a2d4a/jovuvolokofojedunizekipok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11629585-f2dd-4e3b-a782-496cd29c2d3d/jivezak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81704c08-1e1f-4183-8e72-038a17987466/gokimixamujanukomalegabub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd223d8d-5872-4a4d-a5f8-54898f62368b/lamefuguli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50097468-034f-48a0-9b75-ea0e085ce5e7/divinity_original_sin_wishing_well_blizzard_or_volcano.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_off000084a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84A4 4904 bytes
SHA-256: 903a4d4b2b0c1e5e31c62e93090df54d54d141caf071096656f1ed6ea2e6d642
font_01_sfnt_off000095c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95C3 5116 bytes
SHA-256: a9120b72fb66189784ff4e022e7f64435ee7176a5939b2abdfef9bafeaf685b0
font_02_sfnt_off0000a73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA73D 12740 bytes
SHA-256: d9bb755df9fde7c741c7216bae6d14cd958ac50fb0027ef156f06bd8a8ebb933
font_03_sfnt_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 16200 bytes
SHA-256: 173417c5abd32f2e3c3d6a02a181cf9c8696b54f7c2cc6a075683364d8d672c1

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