Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f52902e7ab9fa9…

MALICIOUS

PDF

65.8 KB Created: 2020-11-23 12:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ac8642b04d08e83813ea26d7fc1150fa SHA-1: 1868d4b46269baae05c2b6fa7a9a805ac634947f SHA-256: 16f52902e7ab9fa9bb0fc7f7dc365c468561daeee9bc8168e9794fcb41094aa6
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/123?utm_term=most+terrifying+places+in+america+cast PDF link annotation
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/2632133.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/7081025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452595/normal_5fac1f9ee8de9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445125/normal_5fa95a2bd8bd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5f92957d3b85b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5f942bce95c2c.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/sinadi/baby_frankenstein_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/pibobemovusiso.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/brahmacharya_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/62859366479.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/sherlock_holmes_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/97916762381.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/pokofafevivevezakumavaji.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/teddy_bear_hamster_long_hair.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/ardhanarishwara_stotram_in_telugu.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_off0000c399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC399 5444 bytes
SHA-256: 2475675c3801476d5945fa6310220c449305edd786758d503397bb7d4e8d2b5d
font_01_sfnt_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 10608 bytes
SHA-256: 1e7d633c59c6464a4222fcf98835102545262e175266431170ce89e07a570178

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