Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef2bc870b76ef5f…

MALICIOUS

PDF

72.6 KB Created: 2021-02-02 15:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e0676ccb5e6157372312b796a08a25c1 SHA-1: 4c97fc7c7ae8f277b6f4334b3f102d863416b0fc SHA-256: aef2bc870b76ef5f8e2d722573e2033bb13689451ca85b35f65881b3ea4cecc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/aws?utm_term=pro+forma+financial+statement+defined PDF link annotation
    • https://zamupegokeza.weebly.com/uploads/1/3/1/6/131637483/mazisi_fikes_wamod.pdfIn PDF document text
    • http://setifol.66ghz.com/luzebubelebolobazofamitu.pdfIn PDF document text
    • http://depofukug.iblogger.org/27014141936.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/aghc3he/e_top_up_card_expired.pdfIn PDF document text
    • http://tiktoktop.design/nekimuluzoxatunakijume1sibl.pdfIn PDF document text
    • http://manekobe.22web.org/reality_is_often_disappointing_meme_template.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/exjdwjc/ice_cream_cake_baker_shop_camberwell.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
    • http://todizegi.epizy.com/20711858930.pdfIn PDF document text
    • http://jibipadesubamom.epizy.com/lake_superior_walleye_fishing_report.pdfIn PDF document text
    • http://segudufarus.epizy.com/boatbuilding_manual_fifth_edition.pdfIn PDF document text
    • http://xekifefo.rf.gd/disinfecting_sheets_with_vinegar.pdfIn PDF document text
    • http://limixumijegaf.epizy.com/significado_de_caliciforme.pdfIn PDF document text
    • http://kagubosewox.epizy.com/minufikedivusegigeso.pdfIn PDF document text
    • http://kijibabekisuni.epizy.com/sukiwafirulivolanegemuv.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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 4956 bytes
SHA-256: 36ba87cc835e417fc4523cd8a7dd34108ceee7c3be59a3c95a8579835f307fe8
font_01_sfnt_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 9236 bytes
SHA-256: 347a72120d42d6b453c8e50b533e5ddbf6220cc03ea3c9d4746582bef2f75042
font_02_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f