Malicious PDF — malware analysis report

Static analysis result for SHA-256 88528bbd19ec872d…

MALICIOUS

PDF

83.9 KB Created: 2021-03-07 20:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 18421129fc8b457872f51914ee099d11 SHA-1: 1ec9a17622e7212bb48f7cca812ce36834155215 SHA-256: 88528bbd19ec872d6d2dc308b6ad5f294c934086f4a4ea9ea79d2f2c2efe6f24
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 0.9990

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://crophysi.ru/strik?utm_term=what+is+the+difference+between+latin+and+greek+root+words PDF link annotation
    • http://trynon.xyz/plumbers_union_las_vegasjeg16.pdfIn PDF document text
    • http://forkidsshop.online/dowekusabojaf68uyz.pdfIn PDF document text
    • http://cleaner360.shop/learning_from_las_vegas_free_downloadmnoub.pdfIn PDF document text
    • http://tlgfree.xyz/free_android_mobile_app_templates0bfbs.pdfIn PDF document text
    • http://community-day.ru/best_cracked_apk_store496bw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_8a909c39b6ff46368e75c1eeb5e470dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suzujewa/aashiqui_1990_full_movie_hd_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/16517002338.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/pokemon_gba_emulator_for_ios.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_e56e88ebf6e44c5f993dfb4b776b9202.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/html_css_interview_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/giwozexibetux.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_1e5f34f7c36747cda6ef15ef1e71f7e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44bfb58d-ac7b-48c6-b5f6-c07f099fc000/langston_hughes_high_school_death.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/familiars_5e_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/gefabimijelolut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50cf8802-ce7d-4f28-80a2-2804ddcd54cc/donate_clothes_philadelphia.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_68c7f6081b0f472da777806cf081a843.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/lofajasekesodalitow.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/17441549224.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/81171756403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd51e63c-bd55-42a1-8239-96bf594d53a4/american_literature_authors_timeline.pdfIn PDF document text
    • https://2d2ff295-edca-4b8c-8963-05a4d16d90a5.filesusr.com/ugd/7dd30d_20cb5d934449434d92ef635a0db76d6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/brother_dcp-_t310_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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 5592 bytes
SHA-256: 8095393e88a35835eb543d32dc9552ecbeb59ad7a77cfe9787fe773eca1f2d5e
font_01_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 8940 bytes
SHA-256: ea7ff02e92257ad37062b872867c964a515e584678a18114f9e0f4f7e6eff4b1
font_02_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 10196 bytes
SHA-256: d18c56f60a0a53e9708626d24599ed2b17f01918b90cff600fdaf7d65f0de41b

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