Malicious PDF — malware analysis report

Static analysis result for SHA-256 2566b5c27ff60fc6…

MALICIOUS

PDF

70.7 KB Created: 2021-03-30 12:39:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ffc3e426009064c988917b26ab4e3ab5 SHA-1: 7162bc18150f1d8b1fc84dcc73c544f311e7d603 SHA-256: 2566b5c27ff60fc6660a81b3c1e875c77521abe060b18737cab37c5945758eff
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or leading users to phishing sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/wix?keyword=strymon+el+capistan+slapback+settings PDF link annotation
    • https://cdn.sqhk.co/solumapidema/RU08tWT/kibeduk.pdfIn PDF document text
    • https://cdn.sqhk.co/volixusej/J4ijPPk/final_fight_one_apk_download.pdfIn PDF document text
    • http://sununetapa.22web.org/wedding_bathroom_basket_poem_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zunonaselopa.rf.gd/wizunalobiloxozopugorig.pdfIn PDF document text
    • http://nukuxora.epizy.com/archaeological_theory_today_hodder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a98faa8-7b17-4b2f-9caf-8df073e30dca/11269249702.pdfIn PDF document text
    • http://zudagedat.epizy.com/83443636750.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/ielts_listening_answer_sheet_black_and_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c99363-c6e5-43d0-bb88-335fd707b5ef/semevidilufukavekotivasu.pdfIn PDF document text
    • http://soburuwukipo.epizy.com/53612759882.pdfIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_f14c7eb0fe6b43de9feb6108eb6e30ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd1dd18-dc1e-40c0-b404-540bf5592734/jigetiraxos.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/8477831068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fea229c-eb41-4fda-b52e-5f31db6685d2/impulse_momentum_equation_in_fluid_mechanics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ccc93ff-fdde-4f81-8cea-758eb6b8a9bb/is_python_is_a_scripting_language.pdfIn PDF document text
    • http://podekamuxixeji.epizy.com/bsc_1st_year_maths_algebra_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/27453321471.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_795fe62a74784475896ee6c29af4163e.pdf?index=trueIn 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_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 5660 bytes
SHA-256: 13d18d9cae6ca77873e87f9833de088f2f63b2853482496d94a2d33954167376
font_01_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 10012 bytes
SHA-256: 01ee4fd06a809035735689f83238088f213a23ef92537047bda5c0c4cab17b6c

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