Malicious PDF — malware analysis report

Static analysis result for SHA-256 27efb2686c2feb3d…

MALICIOUS

PDF

66.3 KB Created: 2021-04-05 08:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e7d53e14fc92782f179743401a0cd3ad SHA-1: 14687df3b412490e93b135a63d46c77009c3d991 SHA-256: 27efb2686c2feb3d532e899925cbd9cc1f26ef6007c75b4f6ca8906bc13df6e0
186 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 0.9996

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://midufefew.ru/wix?keyword=walmart+threats+reddit PDF link annotation
    • https://sobapaxuxax.weebly.com/uploads/1/3/2/7/132740961/217844.pdfIn PDF document text
    • http://goldstein.berlin/black_guy_short_hair_memezz81s.pdfIn PDF document text
    • https://cdn.sqhk.co/kemivabesu/iuOeHgf/helper_for_clash_royale_all_in_13.pdfIn PDF document text
    • http://infokurs.design/addition_and_subtraction_word_probleyhjnu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491173/normal_6053809c8983f.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/hOjhvgg/95242110011.pdfIn PDF document text
    • https://biluvumilu.weebly.com/uploads/1/3/1/8/131860938/pudipuvevulose.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/jhYmZ9a/wilderness_survival_guide_book.pdfIn PDF document text
    • https://cdn.sqhk.co/mivezifov/c7Mifjg/41488389727.pdfIn PDF document text
    • https://cdn.sqhk.co/rujamuzizogo/hj6hbdJ/word_race_cheat.pdfIn PDF document text
    • https://tadafami.weebly.com/uploads/1/3/4/3/134386911/bojipelipeto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_6032fbfdeb0ea.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/dhgzIE5/counter_strike_1._6_classic_original_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/fOMihhe/complete_pure_mathematics.pdfIn PDF document text
    • https://kixuvatapowow.weebly.com/uploads/1/3/1/3/131383305/9590882.pdfIn PDF document text
    • https://cdn.sqhk.co/xororasomig/BKkJhaV/flying_to_florida_from_chicago.pdfIn PDF document text
    • https://putoxovomugov.weebly.com/uploads/1/3/0/7/130739063/10b58da570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_60307126be825.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/gatazeromij/roald_dahl_charlie_and_the_chocolate_factory_book_read_online.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/sales_contract_terms_and_conditions_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/are_wrist_blood_pressure_monitors_accurate_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/livowakevejapowaxozopo.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_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 5076 bytes
SHA-256: 5a3bc090660a072167ef9d17d79d1773d3379904b9523e5f19460282d5a53ba8
font_01_sfnt_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 9272 bytes
SHA-256: 31a47988fa8dc46ad8246a43ef40e0b57eb6b5fafed440bc981ffeeaaf5ca2ce

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