Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff32f0e0356f8ac8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 22:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e64bccd62be691aeb28152a5a901c211 SHA-1: 3d033574f241632f2a91b57c682e8954e186f486 SHA-256: ff32f0e0356f8ac8971f73bb694cde804636d26c4e47184bc77a09823d5d631f
126 Risk Score

Malware Insights

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

The sample was flagged by a ML classifier and ClamAV as malicious. It contains numerous embedded URLs, many pointing to PDF files on various domains, indicating a link farm or SEO poisoning attempt. One URL, http://phuwangnam.com/user_file/file/tepuduvi.pdf, is specifically identified as part of a link farm. The PDF structure itself shows signs of manipulation with duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://phuwangnam.com/user_file/file/tepuduvi.pdf In PDF document text
    • https://drproperty.in/userfiles/file/junoluditoxagefom.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161382e1725a08---75690792271.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/mumuxomimomov.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/tipivitimetatoje.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/72813089320.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/42850033042.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/wutirawuloguvevaxoxa.pdfIn PDF document text
    • http://soupworld.de/upload/file/7385361524.pdfIn PDF document text
    • https://websbag.com/uploads/files/duduxomemulesuv.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/falidazesenikaxusetewuno.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/2553586658.pdfIn PDF document text
    • http://njchemland.com/upload/files/47834232447.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/78615291733.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/79454067092.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/97121813198.pdfIn PDF document text
    • https://rm-parketi.si/uploads/kejebeluv.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/wamiraridemagorosok.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/82050289327.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/89767714331.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/wazaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+daughter+of+time+pdf+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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 10924 bytes
SHA-256: a2d3eae57433f277b96240cd19746e35a74452925cc1d45a0eeaaf2289656432
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 18024 bytes
SHA-256: fd965475cc65fc46ae5d4ddcefeb7079fddffb11b459ba2b7e5ac33191e1d10b
font_02_sfnt_off000122c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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