Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8189d010685b474…

MALICIOUS

PDF

89.6 KB Created: 2021-09-12 23:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: fb2ff6c8726d9b71a7eb41df7d181182 SHA-1: e1134670b8b63a4a2b57fe6f5c57d5ba5b71ce12 SHA-256: a8189d010685b474f9b337da6554060a4234f43d4c10097145bfe5cad7b94395
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to unknown PDF files hosted on disposable domains. This suggests a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://etcbt.com/userfiles/file/65739948805.pdf In PDF document text
    • http://ejmk.com/ej/upload/files/jipereditujadiwokona.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/94243836384.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/xurodaxajesigodokavikus.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/nemulajukawadisadowaxudu.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/39776441527.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/zavadudedakosob.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/dosoxonasunabiwo.pdfIn PDF document text
    • http://theponghop.com/upload/files/43598299733.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/xatibuvagigawimif.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/60632500845.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/tipotapavereluwa.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624095c220---noxakelovanikadelejomaja.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/nevobogadarab.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/nozozurikuviwoke.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/39128097683.pdfIn PDF document text
    • http://tabletopad.com/images/file/75828168393.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/gepojimesele.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210901121747.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/36479446738.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/xepusatowakowupawazoliwol.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132603d8eb53---soleminazimodosajiga.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/12548032270.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210909123718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sayyid+qutb+milestones+pdfPDF link annotation
    • 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://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_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 19584 bytes
SHA-256: 9603733c2772955410c297382973a0e94878206ea8470581a28b2d4ffa472847
font_01_sfnt_off00012708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12708 11132 bytes
SHA-256: 0e40148a642591aee24b2c97227e4abb8f2c327ae171aa4f0735a85b7f65803f
font_02_sfnt_off00014094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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