Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fe4eaa75064adb…

MALICIOUS

PDF

85.5 KB Created: 2021-09-24 08:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 217dfbbcb2b1e76f701fff35cb8dfa80 SHA-1: 10b9a2a0f0374052ee4735cd3dee30b33213d475 SHA-256: f8fe4eaa75064adb92a212767561bab676a7b8b87dcdfb4b4a394006c559f7ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs, many of which point to suspicious domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://h-st.nl/bestanden/files/wivurilibem.pdf In PDF document text
    • http://artepcb.com/upload/files/kutezagefexegutamagime.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5tm6h4m60jq4n7pm2u3352p8a6/25704040838.pdfIn PDF document text
    • https://digireg.it/upload/robozunumedajulidiwasewi.pdfIn PDF document text
    • http://tochalco.com/uploads/files/11584279780.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/kezupotizafezorumorisiguj.pdfIn PDF document text
    • http://myphamasia.net/upload/files/wajagutixejed.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/94987634516.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/54920600741.pdfIn PDF document text
    • https://adikkedua.com/contents/files/votikezebelex.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/60601368917.pdfIn PDF document text
    • http://penal-garazh.ru/files/65185512577.pdfIn PDF document text
    • https://netlandschool.cl/files/70417074774.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/43652203582.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/85799436005.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/78452400678.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/56768885078.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ce88j1vifvjkhvvm47ljak8mkq/40829257592.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/80053959815.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/81154897075.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/13362213339.pdfIn PDF document text
    • https://magerp.org/upload/files/fupiza.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/xatagosodanepijabulada.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/65596783219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+copy+settings+to+new+phonePDF link annotation
    • 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_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 10764 bytes
SHA-256: c2eb5a0d0d958b42cbac7efdd4b5fc9e9615de87f762a69855427cdf019066be
font_01_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 17620 bytes
SHA-256: f1691d4f8b0336077f5893969f9d949b7de5f2940b92a832c2bdcb90a13d6adc
font_02_sfnt_off0001303a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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