Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9ae582b4a1d51f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-23 10:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 210013fe620af8a1280dafda7c6b86f9 SHA-1: d1c0c2e9072c76a607341ba8e130065bcc540bc8 SHA-256: 8c9ae582b4a1d51f2c8b073034826cccde80e42c4a870ffd9f404d9a1694223d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://umbabox.com/userfiles/file/lafonotigisufimaw.pdf In PDF document text
    • http://ersenergy.com/UserFiles/file/39108487600.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631185861.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/43678188548.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/sidazifaziwu.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/budugamakudoxirunewip.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/89050972422.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/vomakuwuwogorikivu.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/zisuzapoda.pdfIn PDF document text
    • https://birudongker.com/contents/files/kewijaxajox.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/11856714192.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuzejupevelibefadi.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/jonarepogakepadozowojamo.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/75334686491.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/99147985750.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/40197536555.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/mesejasajodafalapeve.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/woxizonezogavi.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/82757461783.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/77906678828.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/87467070821.pdfIn PDF document text
    • http://abnicum.ru/files/file/96057426530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+prank+call+apps+for+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_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 17396 bytes
SHA-256: 15d2534c52764ee910f91fe4a8e986d86e717eda1dc19d6eb8ec6b8367c343d1
font_02_sfnt_off0001324c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324C 10584 bytes
SHA-256: 48a91006a5d32b45b7013096b03c2eceba64ffe886dbe4cdcdcb0d944992aa4a

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