Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9509e5b2ab3417…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 02:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d76f779112508841d756f22751c81fe8 SHA-1: db6481a2991e1d0f69962b4515dc4cdd4d5ea366 SHA-256: 7e9509e5b2ab3417938ad468c756270239eee5af5fa295245548b5ff079b6b76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://pixomot.ru/uplcv?utm_term=talking+tom+for+android+download', suggests a lure to download an application. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pixomot.ru/uplcv?utm_term=talking+tom+for+android+download PDF link annotation
    • http://changjiujz.com/uploads/files/202109070201029104.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/xapuvanutuw.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/lawawujizipadepizunewomu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jemanekoxivikapotabo.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/nameje.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/32423946536.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/madoko.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/76843310750.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/59210603619.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/laziwifog.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630526345.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/61529498909.pdfIn PDF document text
    • https://blv.by/upload/editor/files/21458102914.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109061216524063.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/10485346610.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/73459668317.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/52597916934.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/68556302227.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/ludedu.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/96596249252.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/luteraruxow.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161350869af5b6---13663403954.pdfIn PDF document text
    • http://meditopthailand.com/file/41854853211.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/88370727474.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/68869696689.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/5709244708.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_off0000ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 10540 bytes
SHA-256: b7b515510aeeb54c258c260eb6406236cc9cd126829f43c4bbfca94d124c4f1c
font_01_sfnt_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 16852 bytes
SHA-256: 7bf5c58ecf00b8dfd5dfc648119a8fade182ff33d9cc1d832d840b2c90328a73