Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b2db437a3d588b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 23:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3da754a314957daa893ed2c81b37e1bd SHA-1: fc94c3e464ea8a8fd60bcdf39d8ad9576c915f8d SHA-256: c4b2db437a3d588b85a326172b10698e20b0399c243a461eda90589914474e9a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm designed to redirect users. The presence of a "free download" lure and the ClamAV detection as a phishing trojan strongly suggest a malicious intent to trick users into downloading further malware. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ventexevent.se/uploads/file/384316270.pdf In PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/56648099167.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/48912047438.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/tojoxoxedibolo.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/mosugujamavosunov.pdfIn PDF document text
    • http://llux.vn/uploads/files/kadoladosazisasifob.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/86226916119.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/favalukorawijekafom.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/gututojelipasogokano.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090201330131.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/suvoj.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/zifesofovupotu.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/bonadabenatinabivos.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/nawisofanujakugalonudoz.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/76607826864.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134efa6b2e26---8324132972.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/59251216800.pdfIn PDF document text
    • https://masihpt1.com/contents/files/2472215752.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/48910654504.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/tamoresolanekawo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365231c2f1f---99344590359.pdfIn PDF document text
    • http://homeopathyhk.com/files/dunik.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/kibirized.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/96355824607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cod+mw3+free+downloadPDF 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_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 19876 bytes
SHA-256: a71c2b4b107f068f88e1b458a7f53ee47cf6c662904dfaccb6a4f6023f515e63
font_01_sfnt_off0001161a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 10448 bytes
SHA-256: b20791f432221a3ec5a436c2aee0bc154c4f52c8e6959d53a07bf16923fbdc8d
font_02_sfnt_off00012de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1