Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4768a2cc9219bae…

MALICIOUS

PDF

73.4 KB Created: 2021-09-28 13:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: abbdae3d505bdb32bc2b09076d023f20 SHA-1: a3b6789c5048ca3bda00555b37024a4f0877819d SHA-256: b4768a2cc9219baee51c4687b50fcdb554b36adb4c94386902d62e1c2164611f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to various domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://infrive.ru/uplcv?utm_term=android+edittext+focus+event PDF link annotation
    • http://dreiseengrundschule.de/files/lisovokegirok.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/68418232536.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/38732182476.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/gaxifogasozoxilu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/976a02a97266bc5a2460bb1010773443/sisuwemadawugive.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/72149443397.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/49432941776.pdfIn PDF document text
    • https://kawanmto.info/contents/files/99625489841.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/vixosozelizomasef.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/33779806135.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/jeboferuziz.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/medubagigoxerawuwabaxesu.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/xazuwapodetajafimu.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/sodididawaxuw.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/78762352888.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/94640251651.pdfIn PDF document text
    • http://aven.su/userfiles/file/lamewexir.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/67101516875.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/56602224105.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/kumupofaraxudagod.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/litojinuxusimekitubebo.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_off0000b347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB347 20060 bytes
SHA-256: b51bc70a4e1e0d14768ef0fa0be68ffdc428fa4cfc08deaa1cf2243e8202d1b6
font_01_sfnt_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 10512 bytes
SHA-256: 1e2e0386f97b3db616ff7e9ff5b84d3a26b5aafaf81c5311a430470fa02cb8fe

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