Malicious PDF — malware analysis report

Static analysis result for SHA-256 906c5e7351c5d7e2…

MALICIOUS

PDF

78.8 KB Created: 2021-10-01 13:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f08898baf2ccc1f79a3eb6addc972cb2 SHA-1: eaa004f95df1545d66f9399cf9a0cf77f3edffc1 SHA-256: 906c5e7351c5d7e2c930293c84db9a885f3d889fa3e4d2f52b533cfc9d8af179
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many of which point to domains associated with file hosting or potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://bharatceramics.in/ckfinder/userfiles/files/wajizigajof.pdf In PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/83793357205.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/puforebidemet.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/54462821120.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/36287743059.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/zebabozumagaxa.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210918_123027_200.pdfIn PDF document text
    • http://domainecomps.com/documents/files/dupadosexevu.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/tojebulafejepoxelo.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/gipijirevapegul.pdfIn PDF document text
    • https://pecintajp.com/contents/files/ziluforuragirorigewero.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/84257976478.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/zimot.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/7047738368.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3c41f3792---83531424146.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/9072358907.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/77711902688.pdfIn PDF document text
    • http://mrybalko.ru/files/guzeweguxodire.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/foderebesuzaxi.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/junefev.pdfIn PDF document text
    • http://yanartextil.com/firma/files/doguxubemi.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/zoxemenexapakaxivelabivu.pdfIn PDF document text
    • https://panoramabyty.cz/content/lebita.pdfIn PDF document text
    • http://3q1p.com/upload/file/210926230425575001y3c81koy69el.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613717094286d---75764230874.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/75486162611.pdfIn PDF document text
    • http://fikszo-whc.com/userfiles/files/90892367259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=church+take+me+back+mp3+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_off0000c338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC338 20676 bytes
SHA-256: a55c3e370e6a6ab6980039dc69bc4a69ca876fe35092fb569b9a7b0dbf91a607
font_01_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 11140 bytes
SHA-256: 9a01448282830a7644d80bf5e6dab5e52ad414eeb068c839fc5fa8f2a9d1b983