Malicious PDF — malware analysis report

Static analysis result for SHA-256 91715196a11bad65…

MALICIOUS

PDF

100.0 KB Created: 2021-09-12 21:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25b7ec8eeebc3a1696777b940895de4a SHA-1: e66cb4c835e69dfd05bc13f7e31fc001d804f552 SHA-256: 91715196a11bad6529a20d0d3246559a81f6d94ff19e29775d25f535099c309e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, including one using a raw IP address. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the document's nature as a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://creativitagh.com/pevron/www/img/file/jiwuvejodinuduzevixakagop.pdf In PDF document text
    • http://ciba.lv/uploaded/file/mosemajunabatekoxitufaj.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/ledimutasosulerit.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed1814979---kagepakubofisivibuvaj.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/63702986117.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210905195336.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/89260438886.pdfPDF link annotation
    • https://warungmimpishio2.com/contents/files/52006633554.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ddef6f653---sezegurilal.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/23388054971.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/20079004432.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/nosuverutuwujodukizokuk.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/35059367199.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/67127512852.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/powivum.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gazotojane.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/19151852371.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/terap.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/82282874618.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/wodobobunexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=my+name+is+stilton+geronimo+stilton+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_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13847 11032 bytes
SHA-256: 9dd0e423ec0d4b45dfc64d757e5275f5f6322f1a2b312cf642ee659767dd7835
font_02_sfnt_off000151c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C6 18596 bytes
SHA-256: 9cc602304fbaa2f924e5c34e0ec82eba45edb05f83edbad364f62402408403f7