Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9fe774ea4ae057…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 10:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c6b4fad9a00f96b9a87c0753c98e7323 SHA-1: aef5a19b30417af943daa6d2aa9dc0187c6ca461 SHA-256: 3b9fe774ea4ae057e05dc55cd4c119ad9f10cbbc61afda16a7b61fb8ef87dfd3
134 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs and a heuristic firing for a 'download button' lure, suggesting it aims to trick users into downloading a payload. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with exploitation and potential second-stage download mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=sketch+pro+android PDF link annotation
    • https://villanakarin.com/userfiles/files/rulozuvifujokujireme.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/sexepojufe.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/47657563586.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210919063834.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161301cc65d48d---35833929787.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c09f4dc9a---rogawowup.pdfIn PDF document text
    • http://polipack.ru/content/file/87187587040.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/vemaramebodosiliwevewe.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/bunirerow.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/10274073509.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/22777606579.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c281c0c6---18532709975.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/66102708062.pdfIn PDF document text
    • https://kuepancong.com/contents/files/sebinozebavoruxaxa.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/5571460276.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/49366396862.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/jufilezifevibemadibin.pdfIn PDF document text
    • https://triosms.com/userfiles/file/41344814082.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/womezigupebul.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/bapojitexajewotupigi.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/10936272717.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://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_off0000d65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65F 17728 bytes
SHA-256: 52a80a6ed2672e431ceae36d87a481c8b9ddb2f450d43235cecd6b883f4857ee
font_01_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 10564 bytes
SHA-256: 08d1d20d77b56a78b3ec2a2163cba25b540f7b51011f51845b220b43d78faf26
font_02_sfnt_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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