Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6cdb7b3fc9e652…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 11:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5c405a546ce686474d4687c61e7e3b4d SHA-1: 8b79ae78958dc1f39907b2f3f9428d8668d7e4f5 SHA-256: ad6cdb7b3fc9e6520eb7ab5ce9f0c1ae512a707131bde950199677728a793804
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged as a link farm. The PDF structure and heuristic firings suggest it's designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dalycity.com/wysiwygfiles/file/tewamujevej.pdf In PDF document text
    • http://isleford.com/filespath/files/20210916141106.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/juvatew.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/likufojitulisuw.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/selule.pdfIn PDF document text
    • http://st03.it/userfiles/files/junofejifixusexadinemi.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/xesutepoxavujul.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///rafekomojagi.pdfIn PDF document text
    • https://parfumzone.ro/files/file/dijefobobagumuf.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/13262975380.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/63739969848.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/65384217821.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150506b57ae4---44513140661.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/fepuvagogaj.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/mufazenuzujigabibaxa.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/puvemoxubosetifijodalem.pdfIn PDF document text
    • http://polishedskincare.com/minaret/uploads/file/jadogidoxome.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/85679607256.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/majimapitoxex.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210908182545.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/32609410528.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/25172629589.pdfIn PDF document text
    • http://lex.tj/img/file/lusakazag.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/tupemolokunof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=myjio+mod+apkPDF 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_off0000b254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB254 10236 bytes
SHA-256: ad8db5c2717759fac2a1b9e88b63754049d8afde181eaf766ac92d0ea910df07
font_01_sfnt_off0000c935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC935 16448 bytes
SHA-256: fbc0255562a15ace6f8e78cb23d649a23c922b1590093a6872ceaf53d3f3e63f
font_02_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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