Malicious PDF — malware analysis report

Static analysis result for SHA-256 10547052ffd6026a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 04:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc51d5d579e5898edc568e6930a8cc90 SHA-1: 11ea52c051c6499235a05de5bdb3b564978d3419 SHA-256: 10547052ffd6026a317feb0e0d9f87c137dfe990ed6fa590a7de689e6130c797
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to leverage web content for malicious purposes, possibly through embedded JavaScript or by redirecting to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=hauling+a+fridge+laying+down PDF link annotation
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/je1fhch79lq6bvi606mvn7rae4/48459571950.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/verepexujazedixan.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/4566256233.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/48540433726.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/pufatadagomepen.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/60437536837.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/17789055529.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/89270772982.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/xebudusizutusir.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/bagugadedu.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/58637133782.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/digelobivowem.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/90663892344.pdfIn PDF document text
    • https://strechybenesov.cz/content/zapezed.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/luwejuluvizusatuvixumoto.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/61134666512.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/hmn0k9hml9046kfkh8mjqa4gs2/bubako.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/xitumufejudaxaturajagaxaf.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/dibimusudotewiginumofetuw.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/lesuvuzikirumazes.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/kupajufipuzigemoxaperifa.pdfIn PDF document text
    • http://protok.pro/upload/files/11112194218.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/newerikolofiloloresi.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_off0000d23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 17856 bytes
SHA-256: bd23f2b5f51e5459cb1ac7a15b6c6bb07e7e1b9aac9d49fac3a83cfacf5bacbb
font_02_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 10556 bytes
SHA-256: 471893c24cdae71064524f8e95972817a916ea5c49f9aa0ae97754869c3a8015

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