Malicious PDF — malware analysis report

Static analysis result for SHA-256 116a2acc5fab9dbe…

MALICIOUS

PDF

78.4 KB Created: 2021-04-04 00:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2d3f5654a59df456fa1bc029786ad36e SHA-1: b1093670189aee2099ddb4f0acdf7bb37bbedaa8 SHA-256: 116a2acc5fab9dbe2e508e3cf587068f34a7351e1390a39df214a76b4cc50ca1
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://vilenefex.ru/wix?keyword=clash+of+clans+private+server+apk+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449627/normal_603dc673e963a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5fe73a78ec4d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_60611885b6f76.pdfIn PDF document text
    • https://cdn.sqhk.co/zeliravepuj/gc2gd4v/85978368283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_600dc1658dc7d.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/QGjdd0t/pujelofupanurifet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_603a180a00726.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_6044dccfccbb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_605fb7b78dd11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478950/normal_6065de29da113.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/somamere/migudumod.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/66667420151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53de3ba8-d424-41a7-9210-1918d792f14e/46549683009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2067c48-c4fa-45c5-8f0d-52e0213b90b7/introduction_to_flight_john_anderson_7th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/11773789127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735af751-0c75-41b4-a2b2-f69b1de4e620/denanigakupu.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/34592745478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf73ab8-e8af-4e0e-b096-65845de403d3/sujijuviwexiregolezumu.pdfIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_b3870c1028f64b9595ced66de2c022e8.pdf?index=trueIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_834808f5f7a04f02921ff49591fd9268.pdf?index=trueIn 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_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 5272 bytes
SHA-256: 25ecd291604b492ec23aa74cd7f24a3213d3cc827325c20eec0dfa3b0e426423
font_01_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 10980 bytes
SHA-256: e6a7d2ee739ba3941be38a892607dc0b7223c1406acc0c1a769791f528e28da9

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