Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5f51477eddbbee…

MALICIOUS

PDF

105.5 KB Created: 2020-11-23 08:19:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7bebe7d9ba4852fb297a45e105a35c92 SHA-1: 1300a7c5523eaee57ea235c697a2531611c12970 SHA-256: 9d5f51477eddbbeeab48fdff251dc127c8396e6b8d4ad6908c229558be11224b
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or file-sharing platforms, indicating a link farm or a distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/aws?utm_term=cours+bac+international+maroc+pdf+physique+chimie PDF link annotation
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/4828982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f879f7f3012c.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/440218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_5fa77ef8c9139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473432/normal_5fb4af5234456.pdfIn PDF document text
    • https://ditoramaw.weebly.com/uploads/1/3/4/7/134724618/ca3b3802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5f9640f4b5710.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/5f590523-6d57-408b-9a01-b10eae38fb9b/15029725918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed2d6f7-bca4-45af-91cc-604c62292ee9/6619753313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b046badc-1dc7-4940-ab58-00a0bee218c9/lefofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8efd81-d4b9-44b3-bd56-f21e0c0a9b3a/callaway_big_bertha_11_degree_driver.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001707b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1707B 23176 bytes
SHA-256: 8afcb642f536776a35b05c23da570a59ed2e04cb292e4d484d83dfa3ccdce1e9
font_00_sfnt_off00013777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13777 5668 bytes
SHA-256: 69fc1499132b030e32717bbb6beba04adc730150d580da465596a19537c50e15
font_01_sfnt_off00014a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A91 11648 bytes
SHA-256: cd088502e088777275b116bf9f20c7e62c494a10ce9b4298df2889dc3061c7ae

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