Malicious PDF — malware analysis report

Static analysis result for SHA-256 7253e6c1d1557ccc…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 04:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15632b3b59e6ada52180c3dab6d97527 SHA-1: c2580ca6eff0c8cfad4d9b233e37641901a35597 SHA-256: 7253e6c1d1557cccb662d262f4ec1f5be6b28a6cff4d26f6143995c006e3483f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external URI heuristics further support this, as these are common tactics for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://matrix-corporation.com/upfiles/editor/files/99974697410.pdf In PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134e10b82b7a---pizepo.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/89784010057.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630943278648342830.pdfIn PDF document text
    • http://ciskmv.com/css/file/zazekume.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/xigevut.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/2782059649.pdfIn PDF document text
    • https://bagstyle.uz/images/file/92677247196.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/1188273531.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210913144701643.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109022309001475.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/xunifizenefufawowijek.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/tumokusopoturepelarivarav.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161377be302971---97555139273.pdfIn PDF document text
    • https://digireg.nz/upload/vadutaborakaxumu.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/46555917497.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/vabisopexipaforadonaxa.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/77520778366.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/36792803318.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/pixewipexurobop.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/51028290189.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/duvawemupaxefukojajafax.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/matikumatakubalokujaraf.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/kimiwebebanogidemukodi.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/66955105470.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/takilugawowozul.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/wuvizufefifokubelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=access+pc+media+from+androidPDF 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_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 10616 bytes
SHA-256: 0c3fd5773e495af78f17ea0d4b201ae5baaa6eddcac5e4fbb1c22daba0f1fb1a
font_01_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 18724 bytes
SHA-256: c72e1b42ac3f16d434e9dea9029f3123345b13e95cfb6c2d78f8ccd30ca06f67