Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab93ff3a60ab8db8…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 03:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5f49e254006dc1c81e806b4edb9e15d SHA-1: 4a9a6f20b48548eb1e90b3d413b86c489356004c SHA-256: ab93ff3a60ab8db8792958a1343cf20102229dcbc11d32e5c2c3fcdea9e0a0bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, suggesting the PDF is a link farm on potentially malicious hosting. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score strongly suggest malicious intent, likely related to spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=mortal+kombat+4+mod+apk PDF link annotation
    • http://taxplus.in/images/contentimages/files/52997326554.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/39953232956.pdfIn PDF document text
    • https://bdata.vn/upload/files/74115674038.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/mobarisa.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/burejedotiladij.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631579728.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/jufojegarosemop.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/42625735800.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/81770232528.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/kudokawamadupexulujanodu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133d35160f5d---19752180249.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/begunuzudulesaz.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/55395181382.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/654560345.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/sokowosijelerope.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/28375337078.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/zapepirogatikinakiza.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/16703655036.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac76c1960c---68865819979.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/mabegaxadipuvijebare.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/58047488695.pdfIn PDF document text
    • https://brs.jo/userfiles/files/zepejisibaluvu.pdfIn PDF document text
    • http://blccy.com/userfiles/files/40314161221.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/bebosujulonitakegus.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_off0000b383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 10360 bytes
SHA-256: c023a21823f980bbbb5f112cece3725f57b511303c47f3e8ee4cfd57f5653543
font_02_sfnt_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 16492 bytes
SHA-256: 3110eff7e32d73b2032e365feb608b47464eaca93163f65b4b77cc93f8358289

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