Malicious PDF — malware analysis report

Static analysis result for SHA-256 1204b561a9e24b82…

MALICIOUS

PDF

77.3 KB Created: 2021-10-13 00:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 08334e8632cb238a8e157b673708a808 SHA-1: a1d019d49249d3fd8bca21dadba363033d442c05 SHA-256: 1204b561a9e24b821db2e2304d05d76f125a447b95380d36040b47e8ce9bf4a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The presence of a 'download button' heuristic and numerous embedded URLs, many pointing to PDF files on disposable domains, suggests a phishing lure designed to trick users into downloading further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smsenerji.com/resimler/files/85464269798.pdf In PDF document text
    • http://dlevitin.ru/fck_editor_files/files/10003484417.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/xatekotuporanunupawazukad.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/xasekujaradakesali.pdfIn PDF document text
    • http://master-br.ru/img/file/nekuxabujinesogexoj.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/69090195863.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/tanopefekupotuzax.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/32624466519.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/50383622662.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/jidemilunawibewowufuki.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/37145869106.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/57543478065.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/87149751463.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/62917541835.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/majov.pdfIn PDF document text
    • http://ladna.pl/user_images/file/tefexefalim.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/52819295083.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/89195059423.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/14435788656.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109010229444970.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153045eaa0f7---50712319935.pdfIn PDF document text
    • https://marosme.ro/hirek/file/kunedosabodolirod.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/dalejudir.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/lowonivedepo.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/zajezomamojo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TxADE9PCSUw/uplcv?utm_term=twixtor+plugin+after+effects+free+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_off0000c84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84E 11048 bytes
SHA-256: 1f5107da4092984ffae5b19096bd51294dd583f4f764254490d23b9d1e0ffa8d
font_01_sfnt_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 17452 bytes
SHA-256: cef30ce5c22414b271ecb063cce3f5bda3901a97bd2f15e188917f578ba4a46e
font_02_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1