Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc5e5ad126a98fe…

MALICIOUS

PDF

105.7 KB Created: 2021-04-05 17:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b637a6ad719c29d7284d38acb77664b1 SHA-1: 80e97ec89b7b83b26b072c0131a78bd641107163 SHA-256: edc5e5ad126a98fe6b0b5ffab872d326fa8c6fc408388a1bdebb8dc5aaa3ae3c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many of which point to disposable hosting and appear to be part of a link farm. The primary URL, 'https://maypoin.ru/strik?utm_term=density+of+salt+dissolved+in+water+chemical+formula', suggests a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/strik?utm_term=density+of+salt+dissolved+in+water+chemical+formula PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481831/normal_60295e39aee18.pdfIn PDF document text
    • http://zumufaxe.iblogger.org/2279225550.pdfIn PDF document text
    • http://save50it.info/html_tutorial_for_beginners_in_tamil6xmh6.pdfIn PDF document text
    • http://easybranding.org/24833922500howlv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_5fdbc3c0c0b5b.pdfIn PDF document text
    • http://reduslim-europa.site/chamatkar_full_movie_dailymotionu2hne.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/4fc5ec64-ca71-4dc7-a58f-f5a34a6b786e/pronoms_relatifs_exercices_avec_correction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0afd8354-6915-415b-8996-95140cbcfeaa/63546127538.pdfIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_4f3c11fa62c74739872ba5a431cc441f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc1f0fc2-75bc-493d-a457-79b3984f58c8/harry_potter_book_series_special_edition.pdfIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_14ecafd434734596b05e31feb480ed18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4eb3400-7ce3-45bb-9dd3-2b32ad252fd9/93112011583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b776191-f835-44f2-8116-a6dea6cf52f9/free_2001_vw_beetle_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7878eaa-9c15-4ec8-9630-58054b5d5d3e/goliath_must_fall_session_6.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_8afeea696d894ad2b53b356da1d528d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bf17f0-eba6-4a51-ad97-46f0c1b5ebe8/machiavelli_the_prince_summary_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafff498-7ffc-4bf7-9ec1-2f04afc0022e/descargar_norma_fssc_22000_espaol.pdfIn PDF document text
    • http://duwosemomim.epizy.com/16088511576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adee03ef-5a85-49fc-be0a-09987e76aec2/simple_present_and_present_continuous_exercises_multiple_choice.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_off00014657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14657 5516 bytes
SHA-256: 97d49dde1247d3c7f3df87a943b710b7999433338e2fd92a00fed056e19ccf71
font_01_sfnt_off0001590f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1590F 13004 bytes
SHA-256: d5ff4b3ef44916b3a950f768844b0b39c0e2cb93d86e416685fc2859fcb424db
font_02_sfnt_off00018478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18478 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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