Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f8f41c5dad6f85…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 09:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac2bbdee7a135a861bb9156cd6bf71f1 SHA-1: 226344971ac04c10d2aad7fc474a07f96a7f9f9a SHA-256: a4f8f41c5dad6f85e081ceea7697016068c0403f3b1982253aa1cb226f8625b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to serve as a gateway to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=moonshine+icon+pack PDF link annotation
    • https://matricula.netlandschool.cl/files/19080472100.pdfIn PDF document text
    • http://artio.pl/files/files/pukajoxa.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/80751713766.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0341aa5260faf136a0db5cff87cdff19/38900129361.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/10060304694.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/98019068038.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/lobovireruneposexibiku.pdfIn PDF document text
    • http://nhakhoanhantin.com/media/ftp/file/libata.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614434136a88a---vejuwugopa.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/kumevowipubo.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/suzusewinetizefigepanuxo.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/rasuxomajiwigen.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/41063050619.pdfIn PDF document text
    • http://humanlitech.com/files/files/tosem.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/xanisolixuwovatubotit.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/20585012894.pdfIn PDF document text
    • http://briztravel.com/upload/files/98270866231.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/701278160.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/27737318348.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/54125646978.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109161336491705.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_off0000bb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2C 10312 bytes
SHA-256: 0ac316ef286f5e30b9d70fce09c63c07f693aba0bc3435709498380c08d88df8
font_01_sfnt_off0000d262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 21136 bytes
SHA-256: 22009baa423f99613190a65044d00ca79324d0d9e480edf8bc5f5c40b1f5e287

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