Malicious PDF — malware analysis report

Static analysis result for SHA-256 b476c99642ea31f4…

MALICIOUS

PDF

98.4 KB Created: 2021-04-10 06:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bef3c8625711b86fd364d41e52a9e464 SHA-1: 850a9e1e2119f46e5f1c2f14cd7de332d2184c88 SHA-256: b476c99642ea31f4e8e393fecced26f412d7e7de862e7979c0b7169d1bbc8291
156 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 0.9998

Heuristics 5

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=what+is+the+formula+to+calculate+magnetic+moment PDF link annotation
    • http://mevizazivi.22web.org/33567885145.pdfIn PDF document text
    • http://wedevaz.sportsontheweb.net/functional_requirements_examples.pdfIn PDF document text
    • https://judezasisurag.weebly.com/uploads/1/3/4/4/134498900/122608.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/0c8d9f099dd5f.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/woboxutob.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/b6a0a4ca-35b6-4701-8eb9-5c3fe713190f/45836688170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1fcaccf-bc2f-4fa3-8342-bea67e2e3955/why_is_agenda_setting_important_in_public_policy.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/article_about_fashion_trends.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/kodeluzexomezusenilod.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/mogutez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148ddd8b-9283-49ff-84dd-b23023fd4c98/41438851840.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/saxenufidokipotud.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/venekigijurunofazamuvik.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/67325307605.pdfIn PDF document text
    • http://lovafis.rf.gd/29802842653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb768e70-ccc0-481c-88aa-214f58b28e33/homelite_gcv160_pressure_washer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/74297308571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373396c6-2cf7-45d2-826d-466296da6b7e/85356473001.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_off00013ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD6 5308 bytes
SHA-256: f75390f8f930e7acd9ec7542525daf68d6993cddbb866d6062052b6c4a5d7f3a
font_01_sfnt_off00014cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC8 14632 bytes
SHA-256: 93533caba158f1f4e64a218342b5f42e0d2a9f5c096445a8dd9a9be4799f9367

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