Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16e9b928b62629d…

MALICIOUS

PDF

71.4 KB Created: 2020-11-14 05:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1037b1b1446958fb7044729d1d008bb0 SHA-1: 9dd9562529f8c47aaf41ee125beea4eca8b40fb2 SHA-256: c16e9b928b62629dcbdf0d9e38fb49b730aeddee0db55b60785c8539bc99091f
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://trafftec.ru/123?utm_term=austin+habitat+for+humanity+restore+austin+tx PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402722/normal_5fa0abb9d43b9.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/3013396.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/vutame/72890979933.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/angularjs_6_tutorial_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/unblocked_subway_surfers_game_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56cc697b-5211-4d35-abe5-4924edfdf30c/chemical_engineering_projects_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/laguna_pueblo_natural_resources.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/gazavawolar.pdfIn PDF document text
    • https://s3.amazonaws.com/sirasu/xurikukopabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52c9e25-3b28-4126-9e38-2b0ed393caea/pokemon_fanfiction_ash_betrayed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf75f7d5-7f98-4f2b-841c-1110b6110bcd/the_overstory_richard_powers_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba012411-a0a7-4142-ba05-70b52fe6a24f/98149378499.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/48516522860.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/catalago_tecfil_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB12 5156 bytes
SHA-256: 546f488f0db3dfd24b2c5e7c75f175af20045917f637f21ca95c33498ab3989f
font_01_sfnt_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 11592 bytes
SHA-256: 158f4c5c7a5230fe4261238c5c259e6a2e8cd61d402681fab73e8f06630de0ba
font_02_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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