Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e9ba225abf4cce…

MALICIOUS

PDF

70.0 KB Created: 2021-04-07 00:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c177aebf5ef0befe8219b43c0eabfd95 SHA-1: c53569a4b24b4b5f24f0b090e0cc285ee42d41a8 SHA-256: c6e9ba225abf4cce34461849822619b8ab2b18b80dbcb54078c265ee9ec4d2ad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=acreditacion+universitaria+en+el+peru+2020+pdf PDF link annotation
    • https://gaxatibixowoki.weebly.com/uploads/1/3/1/4/131452935/4178299.pdfIn PDF document text
    • http://kpupnov.pro/43744312811aexze.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/f76edd.pdfIn PDF document text
    • http://oneitstore.info/when_is_snk_manga_endingtm8fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_60552e2b88872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_60674f5a1f2d1.pdfIn PDF document text
    • http://lasleymarkt.ru/hp_laserjet_pro_400_printer_m401n_service_manualba60t.pdfIn PDF document text
    • http://afterdealer.pro/53823763041zeqxb.pdfIn PDF document text
    • https://molipose.weebly.com/uploads/1/3/4/6/134644393/9512514.pdfIn PDF document text
    • http://hookup671.site/rataxonukuix56d.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/puwiwemotukesezosojovetucnfk.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/8703c792-73c7-447f-825e-24c7fff55c6f/why_freezer_not_freezing.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/street_fighter_iv_android_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/10153473009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f23181-909a-4e06-9316-daa20dbc76c8/jitolonikegoxezubenemofun.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/sowozirenuxomoxaki.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 5472 bytes
SHA-256: cc60b863d0cffa185a9640073aa1c47626935c5c6afd3899b79988e0a2c1b3e2
font_01_sfnt_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 11532 bytes
SHA-256: dab11f4f16a4be06cc97335e0edd5ee705f79daea660137d9459ef80ee3eaaf0

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