Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b019acc0578336…

MALICIOUS

PDF

70.8 KB Created: 2021-03-28 21:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0673c87873cf74d0b63481e885075cfe SHA-1: 45a5b3690b18cc0cd46753aab542930a6e6064ba SHA-256: 80b019acc05783366b78754dd2d64bf6d6224a4d7feb89a2d2c6d49825b3e349
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 are hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://leonvi.ru/wix?keyword=hudson+heights+pediatrics+reviews', is presented in a way that mimics search results, likely to attract clicks. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=hudson+heights+pediatrics+reviews PDF link annotation
    • http://bapatavusirave.mygamesonline.org/brother_dcp7065dn_software.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/Vna6Ujh/clash_of_clans_best_th7_army_composition.pdfIn PDF document text
    • https://tajaleder.weebly.com/uploads/1/3/5/3/135320318/f6b1a7588.pdfIn PDF document text
    • https://jonexizuli.weebly.com/uploads/1/3/4/2/134235370/d775abf46272b.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/75778286677.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/YBWhhUJ/terminator_dark_fate_sequel_to_t2.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/f10b526a-1874-4a34-8c4c-81670647d75a/19728760427.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/arabic_phrases_with_english_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/r_blends_worksheets.pdfIn PDF document text
    • http://vunonam.atwebpages.com/29247130328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae05d5b-9f5c-40f8-a695-166fe1f2db0e/how_to_start_financial_modelling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff9a3a7-ebf3-4f91-b84b-85490c25c983/86694850167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e3e023-2a30-43ac-bf32-60058fe0d793/67281770939.pdfIn PDF document text
    • http://jujobope.atwebpages.com/82898275938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e79291b6-8c75-4091-a4d4-849aa7ffb3f8/13_signos_del_teatro_con_su_significado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cabca6b-a971-49f1-8000-7f1fc14a9fd8/1014217922.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/9576541138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c9139c-2e1d-41dc-9cab-15cdaa0560b2/20193848533.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/bise_lahore_11th_result_2019_gazette.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/53908069900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70cfe905-89ec-4499-87f2-a24dcbe08ea9/logav.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_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 5416 bytes
SHA-256: 787e2a32219dcd3bfb4d04163357dcc1ca27a846e7a5af82b721c4c97e5d0a3b
font_01_sfnt_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 10384 bytes
SHA-256: 7edd5cb0376b0fd75d3f8e7891d12662e4219d771c027f3278a7ab318e341f9a