Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a6f61e499fa769…

MALICIOUS

PDF

75.1 KB Created: 2021-09-10 08:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28790ef35bf46da2478abe13fc2c9ad5 SHA-1: 22549a5100694d4f89576c84a4187c505c3246a0 SHA-256: a8a6f61e499fa769b2ed5985fd6d83762357e5a6e9653c5160c5171ac985866b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of external URIs with UTM parameters further supports the lure of a fake download, likely leading to credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=minecraft+free+download+full+apk PDF link annotation
    • http://biznesfishki.ru/files/userfiles/files/nofiregefarexobup.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/juvadilawero.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/88549098270.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/2425281999.pdfIn PDF document text
    • http://retrofotr.cz/files/file/webafeduvolubezagojaki.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/buben.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/64327975638.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/77774531951.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/26316255150.pdfIn PDF document text
    • http://chinalabware.net/d/files/kavofirex.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/78284732680.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/zatonobob.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/21837027986.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/kopovofifujagivutip.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/54536474327.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-8/20210908010217969486.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133faee85dcb---tiwabafukira.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/69229868149.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/49065714923.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/t7lpj7vchtnt8la3ud9lnh5lhe/komoxosavedipuke.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/47594231949.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_off0000c19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 10716 bytes
SHA-256: 13e27ccd915a531825122d8d0962e6dfe748dfb80815535f7ef9d37eb801fd99
font_02_sfnt_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 17268 bytes
SHA-256: 45902cdb6ed67f6e6b3746eb0f3e51a55e1c4cbd7027ac4493064408ae2b3947

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