Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf89aca34728dfa…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 02:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb9ac9caa74424760d172ba0239dbb68 SHA-1: 93cafcd32f9cc0c519bf489e7037c083a43aad1a SHA-256: 5bf89aca34728dfa90e7a8296c291bc88425e834dd53b950ac0cec554e5ee817
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable hosting or are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and embedded URLs points towards the use of T1566.001 (Spearphishing Attachment) as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=how+to+add+friends+in+minecraft+android PDF link annotation
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4e8ca38da---rujewuzekusata.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/rovowimi.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/9333080356.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/kavofoxedab.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/fekobozi.pdfIn PDF document text
    • http://micruts.org/userfiles/file/dutovodavinuj.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/talamujot.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/tusoxodosimufe.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0508034232aed40817dd410b1ebdfd7d/7177241569.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/nawepozijug.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/151105201792.pdfIn PDF document text
    • http://stringladies.cz/userfiles/lijivogizakozumisefuwut.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/bebowomivagoxavumujoroli.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/lifugituxemixaxanaxis.pdfIn PDF document text
    • http://surestegc.org/documentos/file/jofazawuvexovuxufi.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/jewureginojugimizubopiv.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/pamatos.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/51423635443.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/24668698638.pdfIn PDF document text
    • https://uangraja.com/contents/files/zovivubipakesazelabuwozuw.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/88078457419.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/gaguz.pdfIn PDF document text
    • 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_off0000d32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 17972 bytes
SHA-256: 7fc323a74fbe7590120a8c5a19d849f8d49845999b060d5923f42fe2addd0855
font_01_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 10668 bytes
SHA-256: 8a52eefc7026a3771245e739e0548d15414b113c35e6f6f6fca8791d2edd813a
font_02_sfnt_off0001199d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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