Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbe3ca1994a7865…

MALICIOUS

PDF

75.2 KB Created: 2021-09-21 00:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2d6bb587535c76adaa4ad06cf42dc95 SHA-1: 92753c5c3493660cf4ae64d21546a4082053fd93 SHA-256: ddbe3ca1994a786513153ff2e2ba323a39ff8baaca802e4fee2077f132301a2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=tegra+crafting+and+building+apk PDF link annotation
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/kugidutimodofefomufo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/10091229575.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/lusemofowarefi.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/75854202731.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/zuzofobidugukavatuzez.pdfIn PDF document text
    • http://i-physiology.ru/upload/lukinanetetegefaxevoxo.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/rukaxuwukeluzaxukusamide.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/72071046535.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/18272028907.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/2410932269.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/gixitim.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/24575501909.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/90260447367.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613471d6bd526---22178833280.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/29191252441.pdfIn PDF document text
    • http://soles2walk.com/data/file/kijibisaboxib.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/welologexivozurodawi.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/79926237971.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/79185818096.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090322134273499.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210914142407.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/rosesexefobowovul.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614418f81ebd5---69434057178.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/jikorugubunejexovo.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_off0000c112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 10804 bytes
SHA-256: b141402ecb8762cbcc6faba8f546cbbead2cf86c8a20a9601c469eb5e4f8e6dd
font_02_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 17640 bytes
SHA-256: 6fbc76faac8babad572588c8b3ab607c6155c3152314e23589e9d7de01806dae

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