Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e0d8274677ca05…

MALICIOUS

PDF

92.4 KB Created: 2021-09-18 11:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a602f380769e667f1a01ca8140d310c7 SHA-1: b6ff6137841540e74bf9268e6dde57e5895bb2fb SHA-256: 51e0d8274677ca0508a4da45d3f5ab29f5467f715a31e2541cf0973ffdc4c92a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, many of which are disposable. The embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dalilak1.com/userfiles/file/99063786239.pdf In PDF document text
    • http://kiddeefire.com/media/userfiles/files/6008384169.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/xotebizipirifusaguxufov.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/gamarubinelebibaguvazul.pdfIn PDF document text
    • https://photojet.net/userfiles/file/demazuj.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/nipixijutu.pdfIn PDF document text
    • https://funbugs.ie/files/file/talibitogedugepowod.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/loseluwafagimuduvipanom.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/zizurefodasobonufaride.pdfIn PDF document text
    • http://accronline.com/userfiles/file/zivojovosowe.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/wexunugevevitoduxexisimi.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/vudunimesasagala.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/betedukunemolu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/79o5gcvhemmunpq8t4fnt2ll10/naxiwotedupirumivopek.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/sapajafa.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/pobewiniponodovudijuzoje.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/sozafadafij.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/bopojiwuzuxa.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/51076743420.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/92731347385.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/11702990618.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/71531563490.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/16959915459.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/sofowuginofelubupaga.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630536776.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/bidobikukopidew.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a786e612e---roxilutoxitovotajife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fishing+game+mod+apkPDF 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_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 18212 bytes
SHA-256: 9201ba3f88c99b5f8410ef2fe5fcd52e5f34ca7a7687fff368795c8adacdba15
font_02_sfnt_off00014bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFE 10664 bytes
SHA-256: 2504576ef5bc335c23734a2ac2ca322afb7ce3cca18bf77ca9173e380f74faf5