Malicious PDF — malware analysis report

Static analysis result for SHA-256 516e92ab0021fff0…

MALICIOUS

PDF

79.8 KB Created: 2020-11-25 15:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ec9111a0e4cbb3b56684c350f4b321db SHA-1: de93e41c4f3e017bfb54e3037dd33fcc8c8ad43c SHA-256: 516e92ab0021fff0be3b053bf3255b26791c170e14e843d500780cb63f1e9865
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://traffset.ru/strik?utm_term=5+factors+that+affect+metabolic+rate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449417/normal_5faf2b800ff96.pdfIn PDF document text
    • https://dujezipiver.weebly.com/uploads/1/3/4/6/134610991/fdda9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454438/normal_5fb7922756b15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5f8a50587517e.pdfIn PDF document text
    • https://zunejafeg.weebly.com/uploads/1/3/4/3/134382709/mafuzuvafevudet.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/nefiwajobanus_xejazesi_zogiloj_zumugogupega.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/resojubetufekunod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5fa6412e70f07.pdfIn PDF document text
    • https://ribimefisele.weebly.com/uploads/1/3/4/5/134516567/vamovam_mifesojadanoz_rusenujom.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/117c5980-9187-4001-86a0-c4645b57c294/29877770517.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/mofimodakop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c8335c-4bb1-43d8-a22f-3ac772e8fda5/10760080206.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/size_guide_asos.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/realidades_2_capitulo_1b_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/zearn_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/48570754832.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_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 5288 bytes
SHA-256: 5e71b68d98f0d388794e39debbdba9e59eefbfd67de6ac03816ce558772c0d34
font_01_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 10908 bytes
SHA-256: 969a0b858f2786a93af03818a226fab5a67a219f4d7ab910f17ca8221f3697d5

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