Malicious PDF — malware analysis report

Static analysis result for SHA-256 472a9bcb7e1956a6…

MALICIOUS

PDF

117.3 KB Created: 2021-03-18 12:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6f8ad3d1ea5384e3c5099b71e110ebc8 SHA-1: cc58fafdcd2c108292254cba45607101d3cb006d SHA-256: 472a9bcb7e1956a6e14cbdf47522834b4f4241844cc650b661dbd00536f1ef8f
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. The embedded URL points to a site offering a modified application, likely a lure to trick users into downloading malware. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest a malicious workflow typical of phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/123?utm_term=castle+clash+mod+apk+unlimited+gems+2017 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482872/normal_601efea446383.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489595/normal_5fe545ad1e379.pdfIn PDF document text
    • http://cheapkeys.site/demavadefoj24zmo.pdfIn PDF document text
    • http://romeita.fun/26964136618l6og4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385009/normal_5ffddefe129a1.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/pokaseduxafubarapawa.pdfIn PDF document text
    • http://itgermany.net/toxicwap_tv_series4bmet.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://kufekisawisewo.onlinewebshop.net/20840068459.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/46162316074.pdfIn PDF document text
    • http://kusababi.onlinewebshop.net/luvenalorim.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_992d49aa7752493d8c2eeb28581d9840.pdf?index=trueIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_8c78d6a6c8aa42439e425f81fb8a4a1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68196621-a452-48a3-b322-a469a0887686/excel_vba_dynamic_array_as_parameter.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_ed8025ac505945339e57b13ce1e16e3d.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_b169bdbcc4b14769a23f6970395c0d48.pdf?index=trueIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_da22aed71779479bb8e0a224a26cb9fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd5e696-b559-4318-b38b-a68b4fdd6795/kagefigafubusew.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/audre_lorde_poems_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a05d2d3-699d-4652-ae84-c2102f68dfce/paxevetarakeruzotuf.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 6424 bytes
SHA-256: 4455747fda9ac97410526ac3fee3ca643cc61cb592146befb7df79af2604d95b
font_01_sfnt_off000124e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E9 5764 bytes
SHA-256: ee2d4c5ba7aea406adb87832662e12810bf8d63d7c150958f6e56067ee803816
font_02_sfnt_off00013872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13872 21096 bytes
SHA-256: b84aaeea52bec48a0f36c029e0e8138d20c88ff8e238aa9fa3b610bf2bafae93
font_03_sfnt_off000177d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177D9 11712 bytes
SHA-256: c69dcbc08f945634b5a380fc8af70b3a03da8f1d132bb79fa146572ba58fd55a
font_04_sfnt_off0001a031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A031 16924 bytes
SHA-256: fee10ecaf604676dff196f38307b789e876e4aa08c246a0bb350eb07fa32d704
font_05_sfnt_off0001b833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B833 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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