Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1b58a40b367c8b…

MALICIOUS

PDF

74.6 KB Created: 2021-03-20 22:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a2bb1506d9bb65f38f8cd829970478b5 SHA-1: 175e3d0379445bd576e4c605fbb8d32341e87189 SHA-256: 1a1b58a40b367c8b559951d0c133824bb74f621cc8a96cb7edf1470a972213b7
66 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 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 4

  • 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://zajinet.ru/wix?keyword=function+families+worksheet+%25232+algebra+2+absolute+value+answers PDF link annotation
    • http://valuburikodajad.medianewsonline.com/19764006804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_6009cc30ad003.pdfIn PDF document text
    • http://parralax.net/22652866455r1nb8.pdfIn PDF document text
    • http://xufopizaxeto.medianewsonline.com/que_es_variacion_genetica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_604e46243de3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488556/normal_5fe3c754aff9e.pdfIn PDF document text
    • http://marketes.pro/how_to_fold_heart_with_square_paperihjza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477630/normal_600d7ae208918.pdfIn PDF document text
    • http://hairhome.moscow/82266616610zonii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_603fa6cd35635.pdfIn PDF document text
    • http://business-open.online/jugnos_monster_pizza_contact_numberyd06s.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/bipepezuwed/38678199081.pdfIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_6f2346fdefe1452f8dd94ed7034a97cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead8d480-7b64-438a-9cc1-c74d9191d86d/introduction_to_networks__version_6.00_-_itn_practice_skills_assessment_-_pt_2019.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_e2412bde79c7462e89a42e07c139648e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e126e1d1-2222-4e2b-82fb-0de59ea7bb46/68516347830.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/journal_entries_for_middle_schoolers.pdfIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_74e52b796fcb4c85ac94b15fb31e30c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8721062-a91a-42ec-8bdd-dfdc5b5d16e3/ge_spacemaker_xl1400_not_heating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7a7260a-26c1-4e4e-b28b-ea8b949bbdb9/formato_para_hacer_plan_de_negocios.pdfIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_e224b3501e194e11ba5b36d36974137f.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 5232 bytes
SHA-256: 1f262a2471510d6e6d7875f894c89182eeee211479fb8b477f8e798743cd1ff4
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 10608 bytes
SHA-256: b0457f59bc152d98d383236edfca5628607e2e056c1a5702bc221aeff2849b7a

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