Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b7613441113e7a…

MALICIOUS

PDF

66.2 KB Created: 2021-03-25 13:09:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 352fbbf1317e79005b5299cf79165292 SHA-1: 893a71c33253cdbf4867dd8d1b8cdb57606c1685 SHA-256: 23b7613441113e7a6c11408f6ae5cd55252f155be5e5ade1278ff4607be83ab7
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://xezojetit.ru/award?keyword=dulux+paint+colour+chart+pdf PDF link annotation
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/ad3493bee93c.pdfIn PDF document text
    • https://kemiponoza.weebly.com/uploads/1/3/4/6/134605011/9893375.pdfIn PDF document text
    • https://fereganew.weebly.com/uploads/1/3/4/1/134131887/tebakugub_rosogiwazesewem.pdfIn PDF document text
    • http://jobware.pro/now_we_are_free_sheet_musicmthht.pdfIn PDF document text
    • http://twoup-viktoria.online/app_for_reading_the_bible_in_chronological_ordernk2sa.pdfIn PDF document text
    • http://job-finder.space/percy_jackson_the_blood_of_olympus_downloadd5gzl.pdfIn PDF document text
    • http://dovamemowiruz.iblogger.org/active_learning_spaces.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/bibejovixapis/43977589750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f95c1d6b-ac01-474f-b104-09fb44c4b6a2/diferencia_metal_gear_solid_2_substance_vs_sons_of_liberty_cheats.pdfIn PDF document text
    • http://zatojigetafugud.epizy.com/sum_41_chuck_full_album.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/goguzil.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/mexiwadovegisuk.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/android_beam_l_g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b9c2e7-d78b-467c-94d9-fb15d0a07144/cheap_storm_doors_for_mobile_homes.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/amd_radeon_r5_m335_performance.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_off0000c821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC821 5132 bytes
SHA-256: 231ff8c49ef857d42793b58a6f2581315c70cbcb0c7389341fb8a36dcc8394c0
font_01_sfnt_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 10196 bytes
SHA-256: 476aaa2669b4da7095fd72b259db17d51e5497014ad61617528f5bb7f81972b0

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