Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ab673e4207f8b9…

MALICIOUS

PDF

78.2 KB Created: 2021-04-17 15:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3488c95cffcf7a79f4d74a6d4c42c54b SHA-1: dac0c388e2bc62b79e64f4807d716b3636e2e4eb SHA-256: 65ab673e4207f8b9f4a971c2f6cf0095374ada3613d3ee0fc60f684414c6488e
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://druttle.ru/strik?utm_term=what+are+the+traits+of+a+manager+who+has+visionary+leadership PDF link annotation
    • http://penageli.getenjoyment.net/85308227557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_6011460dcb72e.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/sinoka.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/what_is_a_grimoire_journal.pdfIn PDF document text
    • https://xuxomesepek.weebly.com/uploads/1/3/4/6/134681539/dokudadinoboxap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_602a6c8bde123.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/belapawerezuju/mukeke.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/how_to_test_a_air_fuel_ratio_sensor.pdfIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_f2778912523c4f178d5c56a8ae235847.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/43398814445.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/critical_analytical_essay_rubric.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/gopro_shoulder_strap_mount.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/ririsagibelelakusobizuf.pdfIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_dfc8b37c18994b97831e34b2ae819708.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 5508 bytes
SHA-256: 8ffea3aef04e4e234d9ac92797feffa9d423db8a120ab694b572b273e00cc85b
font_01_sfnt_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 9940 bytes
SHA-256: ceae8394345b43b9428378c30fdc66004bb25c44f66e11ff60c0085b50bcd1ad
font_02_sfnt_off00011d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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