Malicious PDF — malware analysis report

Static analysis result for SHA-256 e677e31d072375c8…

MALICIOUS

PDF

75.0 KB Created: 2021-03-18 18:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 736285df97f1d844c351d4e38b3263e6 SHA-1: 9f88c3f640ff10aee27ef3bcf673bcdd56b95a2e SHA-256: e677e31d072375c86a9d0cf6e526e910f0f4796b3a87ed52bae56a1cc8feae36
156 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious or phishing websites, such as the one at 'https://leonvi.ru/123?utm_term=joshua+tree+climbing+guide+book'. The document's content is obfuscated and appears to be a lure, masquerading as a guide book to encourage clicks on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://leonvi.ru/123?utm_term=joshua+tree+climbing+guide+book PDF link annotation
    • https://sepafolelobonel.weebly.com/uploads/1/3/4/6/134614676/2662207.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/nedajopawufaf.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/511073.pdfIn PDF document text
    • http://namibav.iblogger.org/vawejuwegisogosefag.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/xesigeze/bengali_movie_sultan_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/how_to_turn_up_volume_on_symbol_scanner.pdfIn PDF document text
    • http://marobow.epizy.com/best_bread_machine_recipes_with_all_purpose_flour.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_4cbc6d2af0bf44259d988f4ba72b838a.pdf?index=trueIn PDF document text
    • http://mejadub.epizy.com/19347005599.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_22a7a3c8dab44874869423b72dfb742a.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_bc605119508c445a9136c1e69f5e50ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/86764114632.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/rokukunaloxoxaz.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_07adf29a342b407cb3584aa48c3ed0d2.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_fed4a89a5e4d457d84e588603e0152cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c389597c-4d86-4eff-a5ac-3a492b2fdbfa/bewowuvu.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_71c1cee083754be0ac61035bbc417b2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/darius_guide_pro_builds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba7a92f-d414-422f-afdc-1aedbf778e45/lebumorabemeruxesujelu.pdfIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_ccf4f1cc568749f1870e3aef5dcc9266.pdf?index=trueIn 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_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 5544 bytes
SHA-256: dc3280c08d431bc6780dcf6aec8f5313db4a5640f97fb377fb17db83885a84af
font_01_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 11720 bytes
SHA-256: 11e48532759f71dae8c2d601df4ea1da0b72d38d93c3dfa1ae1dc08464d6c675

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