Malicious PDF — malware analysis report

Static analysis result for SHA-256 8295d712f565564c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 08:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 35879dcbb2e4bcd6e87c5191e036b8cc SHA-1: dde43e5b18aed57b137e10534b8968df1377a33a SHA-256: 8295d712f565564c0885cfb5f108f50e110f6c385b45446647b61dbc86360ca8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many using UTM parameters, suggests a phishing or link-farming scheme designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that exploit PDF vulnerabilities or employ social engineering to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=ipad+mini+5+new+price+in+pakistan PDF link annotation
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f4b9c9953eee25a3c974389752dfb1e5/15194130669.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/4038709226.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/xabigog.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/178068706661461f53015bf.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/jemovorokifuxitede.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/58496478656.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210928163278925626.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/rixazawajo.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wibir.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/kabunejimuwetep.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/tilomavoxujegobevixi.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/91783745241.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/jenolemepovafafozibamaxof.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/73445416210.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/56929249290.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/zudoromawidojenutazimuwu.pdfIn PDF document text
    • https://costarica4d.com/contents/files/xolivuv.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/28654570466.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/mugatamebirakofagop.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/71769462428.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/8572521750.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8279121ead42c30b0dfddb58975420c2/91599034312.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_off0000b456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB456 10772 bytes
SHA-256: ed1577e6a6ccc6c3df99786ee2e9db28868622aaa9cd647d829d866699d1ed46
font_01_sfnt_off0000cd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD34 19268 bytes
SHA-256: 72f975a88a6064742e87c895da00cece9f42148adb232dc4025245e77b196035
font_02_sfnt_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1