Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eddbc9ce75219d0…

MALICIOUS

PDF

70.0 KB Created: 2021-02-10 02:01:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d397558e44ee57c702a1769053d64992 SHA-1: dd02b462ed9a767bf9516d985492954b50c5d6f4 SHA-256: 5eddbc9ce75219d0f440b2dba9b26cbb7c566190ed260a59fef610a614ae2375
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are likely part of a link farm or SEO manipulation scheme, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to download further content. ClamAV detection and ML classification confirm the malicious nature of the file, pointing towards a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=caslon%20graphique%20sh%20reg%20font%20free PDF link annotation
    • https://cdn.sqhk.co/vedanoderifu/bqHfggK/zombie_hunter_dead_target_shooting_king_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejagefep/sib8twR/camera_studio_mod_1._7._10.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/lalefijisoxewig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370266/normal_5ffe987787634.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/ehmHiiL/taotao_4fun_150cc_go_kart_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/retagigimusa/ghaagdS/best_crafting_games_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/joribuluf/aKVYyou/xodejag.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/aQN0NkH/gravity_science_project_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/jbSYxje/54405211583.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/lopadivupudexa/tremble_mosaic_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/40482071165.pdfIn PDF document text
    • http://xakireponamo.rf.gd/wiwawodevedem.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/diabetic_ketoacidosis_guidelines_ada.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/avira_antivir_registry_cleaner_computer_bild.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/indesign_magazine_templates_free.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_off0000c9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F8 5196 bytes
SHA-256: 07bda4d962a437b17c356f2c4896ede09ba01bdf18fc6901e3f5338bfffb0dd8
font_01_sfnt_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 14792 bytes
SHA-256: 035657d4111d761e49afbdb1b63c1ee4c6babbfed76767429e66bbf9b2b8edd0

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