Malicious PDF — malware analysis report

Static analysis result for SHA-256 d958ab46795be1e3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 02:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 492353323963de24c5b49a0b7aa65418 SHA-1: 3451cea84dace08dde76ff44c607df09cb34e4c9 SHA-256: d958ab46795be1e3c28bda7689b35f3ce03492aa69d61d3f687af026e405d793
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The presence of numerous external links, many pointing to PDF files, suggests a link farm designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://slxiang.com/v15/Upload/file/202196622234141.pdf In PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/xulapuf.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/76719480817.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/23327415941.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/wejemubujin.pdfIn PDF document text
    • http://ternovykh.ru/content/file/xijorasulekuvizosakipemo.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/kaviwegenawo.pdfIn PDF document text
    • https://intersat.lv/files/file/87498633447.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/49619233176.pdfIn PDF document text
    • http://scro.ru/pic/file/52200850171.pdfIn PDF document text
    • http://cl-pub.com/files/files/50521710440.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210910043409.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/35390d2860a3f2bc0eb614fc5aab533f/xazoju.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/nivijudogufenizuwadojiva.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/71050196892.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/zasozeri.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/42584259271.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/kesimosokafujoxurebutotuk.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/97892420746.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/12131765335.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/wogelarugunasigabugob.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/12616661554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=app+hider+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_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 17288 bytes
SHA-256: 26d6de4420f606e808f53e25480c2e7ba28552dbc312c953bdf9d1ee653fe42d
font_02_sfnt_off00011bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF3 10312 bytes
SHA-256: 18dd1fbfe98a9838577ec4d59ec83fa513082cd6ef66764c8796bae215c5d5dd

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