Malicious PDF — malware analysis report

Static analysis result for SHA-256 2823d20534bb0354…

MALICIOUS

PDF

79.7 KB Created: 2021-03-30 21:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f887b7f8aa1ad372c40fcc36ed500c60 SHA-1: 12a0fcdf17b31212fa44c1140a8fef143aaaaa28 SHA-256: 2823d20534bb0354ba36454533a27ba37b7bef0e7f8acf6bc9ce94ca1597bbf4
96 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 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 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://jacksth.ru/123?utm_term=risk+of+rain+2++multiplayer PDF link annotation
    • https://cdn.sqhk.co/niporatibu/gpjenvB/cellebrite_ufed_crack.pdfIn PDF document text
    • https://janonezofeto.weebly.com/uploads/1/3/4/6/134664798/9c64fd.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/mlgfheg/hide_and_seek_maps_with_secret_spots_fortnite.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/Z3hc7he/the_quest_keeper_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/texirova/vuijqjc/titanic_ship_history.pdfIn PDF document text
    • https://gajatizu.weebly.com/uploads/1/3/5/3/135315297/tevisu_ribudamonanujej_lazogorirodej_rulurax.pdfIn PDF document text
    • https://cdn.sqhk.co/detokelixipi/jbvj7jj/14882089392.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/018807e6ee.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/335c6109-3490-4b40-8faf-e63fd9a73518/93607691936.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/89671831602.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/2045185736.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/tezilodanepixazakuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/47852426624.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/alien_shooter_3._4_3_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/nerolidanobusalajepum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac46f28-1da6-4e46-9d91-1c098391cdbe/giximezubutiwodololum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b02c618-af7f-4a49-8a54-978ed236b08d/xoduzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee9a050-ad8f-43a8-8317-964036bc775b/how_to_repair_a_viking_refrigerator.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/83862438745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af9d7492-f5c2-4389-b324-80a4fa0e5ccd/60575526506.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_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 5352 bytes
SHA-256: 1b7cda54eb1b049f214ede9aa987f8780919bca183a35b3ba6b6ed632eb5c2a7
font_01_sfnt_off00010def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEF 10456 bytes
SHA-256: 432859d19a72a7e9550ad114161297a7cceda85b95ee6506b697422515faac69

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