Malicious PDF — malware analysis report

Static analysis result for SHA-256 071374d89b44d401…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 02:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 143e66be6b680053b8af78e7ab435821 SHA-1: f031258c2213fc52f16a30408fa1c3d5d1925763 SHA-256: 071374d89b44d401b866d85476f52c12c7fb76fe5e6de7eedd31dc6cbc04ef49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://monographie.com/ckfinder/userfiles/files/raramejojenude.pdf In PDF document text
    • http://orderkai.com/uploads/files/55451416004.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/4208951348.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/30524923499.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/kepogeketot.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/vezilawerekaziwefesim.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329a5c15dc0---21144992458.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/49165741754.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/miwedubuxowewogisoporapog.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/kuzopimutata.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/werovopezusevobero.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/86565644587.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/pikedutaduzotiberava.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/lunubitewejef.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/biwawazozatiminonifaxeg.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/18291450764.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f01a4fc47---menojuwalugumeb.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/81608198064.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/56012439998.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-07/images/files/nojumutewejusupidawu.pdfIn PDF document text
    • https://eslms.com/userfiles/file/48903571314.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/89997143825.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/rasikos.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/24585730651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=icy+tower+android+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_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 18108 bytes
SHA-256: e8b607e48c5f1c250f57fdb8f2a4166b0e117fdb56074787d7375de1b72dd6e3
font_01_sfnt_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 10536 bytes
SHA-256: 3d9f8141d23e16f7697fcfbe0eff61c8512ffa0dc87b0afcb666e9951d88f5c8
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1