Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae7a4a8e2ed7a91…

MALICIOUS

PDF

82.7 KB Created: 2021-03-27 11:25:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: db43f8315258ffec4725841460ea7616 SHA-1: 942fd4ed71408c3af9b116d807974f86daeee97c SHA-256: cae7a4a8e2ed7a91ec43eb9defe767c17657c8e67a6643727b6c322adb190acd
156 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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=7th+grade+math+probability+worksheets+pdf PDF link annotation
    • http://gasolotiravizid.sportsontheweb.net/odia_book_file_download.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/f6gghci/53608519162.pdfIn PDF document text
    • http://forisawidokomor.sportsontheweb.net/public_relations_strategies_and_tactics_11th_edition_free.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/bhbkjdH/bole_chudiya_bole_kangana_audio_song.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/3NhhibF/99289360474.pdfIn PDF document text
    • http://dabinepoj.mygamesonline.org/11254423156.pdfIn PDF document text
    • https://vijibasotaxeja.weebly.com/uploads/1/3/5/9/135990507/3099373.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/hbigJgd/ditusogaviz.pdfIn PDF document text
    • https://segalupozido.weebly.com/uploads/1/3/0/7/130738693/gokuf.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/e05c3191-5d3f-42c7-84d9-fb18b10d6679/53872659951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94124a4-40d1-4df2-8179-c864e34172e8/68048065353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ad24946-5ac6-4049-9d7e-221d335b9c8e/how_to_become_an_auto_mechanic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15944012-40fc-47e2-88ed-15573e9ce9e7/how_to_argue_with_logic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c49740-a2a9-494b-9a6c-f968a52a8aa9/passat_2006_transmission_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8159cad9-34b4-478a-ba51-6dea69b3a722/66230323876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bba6592-7b0f-43a2-875e-63e5a051c931/35503239139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 5840 bytes
SHA-256: 5c85587671b7011f1c8849922d34eb055a056dcccbc4c6dc1c6d1d211f736bd6
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 12108 bytes
SHA-256: c3cb77cea55331f06ce28634e0964006d6e5b57ccf7f80536f5e545a89901752
font_02_sfnt_off00012394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 16772 bytes
SHA-256: ae9fd4cf447974f57c5b77efb7e2bffecf29ac7911fe73c6cc8a0f2429c46a01

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