Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4f8b669fc5c134…

MALICIOUS

PDF

71.1 KB Created: 2021-03-23 12:27:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b664af0cad9ddae4de463884b5bed12f SHA-1: 43aecd36823cf90f3df231b52a24b56d8a56cdab SHA-256: ed4f8b669fc5c134c76380dab91bc69ded847e8bbf114ef2f3142f36e770a7f4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://resalured.ru/123?utm_term=arquitectura+contemporanea+gavinelli+pdf PDF link annotation
    • http://vetovikaxu.mypressonline.com/mizejirerak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_5fd0a7154214a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_601995c3eb8a3.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/35997474330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_6052f64adf809.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414851/normal_600870b3719fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5fef93c335f08.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/79993319630.pdfIn PDF document text
    • http://zaxofebejip.66ghz.com/67230878250.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/who_makes_diehard_gold_batteries.pdfIn PDF document text
    • http://vemusopudin.22web.org/saint_benedict_prayer.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/radubozufiwo/sandstone_depositional_environments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3752cb10-40db-41f5-9e38-0fbe9c69e8da/what_is_a_call_and_put_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870efa59-591b-4b3e-9f67-5113a0fd5351/how_do_i_remote_start_my_lexus_rx350.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/x15_maintenance_intervals.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_28ee8642601b480493ed7e04e1de5169.pdf?index=trueIn PDF document text
    • http://sunuwib.epizy.com/desol.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_bf0fd67cd5e74f5b8b3d6d9227d8172a.pdf?index=trueIn PDF document text
    • http://sexililelaweru.rf.gd/school_subjects_worksheets_printable.pdfIn PDF document text
    • http://vizomonuzujo.onlinewebshop.net/puxeredukasobes.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_off0000c3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C2 5472 bytes
SHA-256: 2ae8ae060b5487397b50034fbc32d685aee161b28a7d259af2a42f78eac10e0a
font_01_sfnt_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 9896 bytes
SHA-256: af5a7d0200a764289373dde7cb5c7a618130985a92eb4d20913318356675fb3c
font_02_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c

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