Malicious PDF — malware analysis report

Static analysis result for SHA-256 3317172cd80d3d00…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 19:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07bc4f57fb108b28dd8ed916a558ecde SHA-1: 0b36fa5aee8180a211600a96c417389852bb4e91 SHA-256: 3317172cd80d3d009a8c25d3208fa4a93650a99b21824e22f16f4df3321416f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=1+inch+grid+paper+d%26d+pdf PDF link annotation
    • http://veterina-hrib.cz/user-uploads/files/migibegoradeselepi.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/nugabuguviwikarivul.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/jegabovemudakonit.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d10f679c8---87517504135.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/kapavajixuserakiso.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/90461255886.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/1617613575.pdfIn PDF document text
    • https://clubon.top/uploads/files/75535394166.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/99635311436.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/jobajuropesagevofifezepi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134149299156---tidupujibozamatibafoxuliv.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/pilularewunajinubisegow.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/dedamuzikejus.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/20137342643.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/33444818504.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/8166368559.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/42555921646.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/tosugevogevoxezifaxew.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/xogilofedazu.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/mutevasuw.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/8040245420.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/19402295370.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/53814441423.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/52684171810.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_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 10316 bytes
SHA-256: 004cb6cd4e22eabf60e0431f478c52c3e6cac8e13ac6b904b4103e73fccec245
font_01_sfnt_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 17092 bytes
SHA-256: 6036b1724413188bf7b39eda49ecd4b4d49d09b8a7b8a2d928dff74cafd63a8e
font_02_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1