Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf33c2dd648967d…

MALICIOUS

PDF

68.5 KB Created: 2020-11-19 06:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ccd1e5b612a6c9084eb6fb9329ce2291 SHA-1: 98487d2ef7c155d195df40cde126c3c8ac23df1c SHA-256: cdf33c2dd648967d1254aa75ee2bd012b9b7f570308eed88bc784317315532d4
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-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://traffking.ru/123?utm_term=mtna+conference+2020 PDF link annotation
    • https://kisotupojez.weebly.com/uploads/1/3/4/4/134493444/12d8c95f277001.pdfIn PDF document text
    • https://ruwalabipuges.weebly.com/uploads/1/3/4/4/134465281/d746d1c39bdda.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/xugigabitulu/best_2018_pc_games.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/defeletitakujopitinipewo.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/bahia_principe_app.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/85434610591.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/android_java_base64_encode_string.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d632777-76e1-4340-8654-aa78ef909e42/92500785891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149e15ad-70cd-4e6d-ad25-bae870d28fe2/cambridge_checkpoint_english_workbook_7_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f778096-2bd1-49ff-afa4-70ffaa922aca/tagubawumemanonabasesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8364d665-774a-4167-a7ed-a3f40a6eb369/30116925037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9883411-10aa-44a2-aa4a-25f3128a7b34/oak_leaf_trail_detour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd2d842-5fe1-4ff0-a827-6b863729af3d/9051639800.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/43963886012.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/wesley_lawrence_degrange.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dcb0cd4-beef-4a22-8cb4-436f8c02f750/john_legend_gordon_ramsay.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/kris_krohn_mentor_vault.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/touch_typing_practice_sheets.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_off0000ba6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6E 4944 bytes
SHA-256: 5b2409e16c7df3f73594bd1eaa73c5c77195165a0093837795621a647967195c
font_01_sfnt_off0000cb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5D 10132 bytes
SHA-256: 01b6692d570a95f0f9966c37d45764ac58a755f9f3f7e336a30f2f7f3c67caa6
font_02_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 16488 bytes
SHA-256: 1d240a0535f2140f7c954fae970985d54487e451ba4ee00a2f6f8a8e98c285da

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