Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a13571f7c781a0…

MALICIOUS

PDF

78.0 KB Created: 2021-02-06 00:36:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 66a903e8731ef788b41cd5c18b0ddfa1 SHA-1: 1de875e6090304ed9236c2a474451adf0dd67f74 SHA-256: 19a13571f7c781a0cd209a56a784c83b7fe1b257e886ca270d8ccefc73b64b97
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with external URIs pointing to suspicious domains. The presence of a visual download button further supports a phishing or social engineering attack pattern designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/123?utm_term=download+from+kissanime.nz PDF link annotation
    • http://scm03.ru/what_bra_size_is_mia_khalifaemdwf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464529/normal_5fd1117de22be.pdfIn PDF document text
    • https://cdn.sqhk.co/nebinefis/Ngj7mjj/sniper_elite_4_gameplay_time.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/34hhLjj/red_ball_1_game.pdfIn PDF document text
    • http://zakilifawurafed.22web.org/47128862216.pdfIn PDF document text
    • http://naturebiolog.fun/jiforafigegewogonegijumeykirg.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/BYShaUG/adventure_time_squirrel_in_my_mind.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5fd16ffb4b527.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/cBGijia/jump_starter_diesel_battery.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5ff1734fc6722.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413469/normal_5fce991c4a687.pdfIn PDF document text
    • http://konujojijitezu.iblogger.org/41708476649.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445333/normal_5fccb8c400292.pdfIn PDF document text
    • http://sushibara.net/balloon_tamil_film_songs_freeppwj3.pdfIn PDF document text
    • http://cashbackmoney.info/mekipozizexovuziz1fg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_6012972d3d8cc.pdfIn PDF document text
    • http://gitilapen.66ghz.com/alto_sax_jazz_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379613/normal_5ffba65b2c407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 5288 bytes
SHA-256: 33619691df839c63930e452c81964cc4569f146e5b9a7e6242a97a150a649814
font_01_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 11020 bytes
SHA-256: 1611e9a6966e064b7b5f96a01c717d087beff746490a7f28589c813a1baedaa8
font_02_sfnt_off00011644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 16088 bytes
SHA-256: 700ff7bf493bf9bab5e7bd19ce07725d6ad682c9ec1bd4c381fbd4d74ba1924a

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