Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f22ae2a56345ce…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 01:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cd7867ef63063cde5a80cc881cef3a16 SHA-1: 76e305c25ef62332aa3f0c2624384d8e645b77c1 SHA-256: 91f22ae2a56345ce8a64afad03bd7edd1e4621a1aafd89be0d35aee763cf8eff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vantaidongsaigon.com/uploads/files/54935018341.pdf In PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/71844414712.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615601944daa2---5132812109.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/99599510215.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/rebegome.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/vobimimonilopul.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/lunupelofonekizoladulodar.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e899600211---24941312371.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/25730913382.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/bijisovaso.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/63687359839.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/79109995447.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/pesodemekuvekosipuxap.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/31890438261.pdfIn PDF document text
    • http://helix.chuing.net/mai/ckfile/files/nadomesijida.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/67188595632.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145541659273---89957833823.pdfIn PDF document text
    • http://anindecor.pl/files/file/xejegiposemanopez.pdfIn PDF document text
    • http://hidropro.hu/upload/korexotutomigozijotiwegep.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/jodizosabemeguda.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/58567871888.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/97651607242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=business+quizzes+with+answersPDF 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_off0000afc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC1 17756 bytes
SHA-256: 56f1709577a86f904b8bfb5eb22f1ce04c52fba5e9d951bc311a8a8c3b6bb57c
font_01_sfnt_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 10484 bytes
SHA-256: 0ccb9ae887c3fcb347e41673ad58c824a566f80479f9c8b1eee08db24a80ea7a
font_02_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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