Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae63d8f0130d5110…

MALICIOUS

PDF

89.8 KB Created: 2021-09-17 07:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42696ad8338f7c485237429ade41d142 SHA-1: 2d79a30884641b4379b52fca75174de603435021 SHA-256: ae63d8f0130d5110084e6cf6a8b5ad7e6491f5901433e65f2bdb17a72c8ddf40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the classification as a link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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://allytemp.ru/uplcv?utm_term=android+1+wrestling+revolution PDF link annotation
    • http://chistogood.ru/admin/ckfinder/userfiles/files/sigotupoxiwuwasapufegipo.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/a3c39aa144a7d9af2ea19249b728f81d/15808065013.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/15242266082.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/68160892887.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/30711560332.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/ropedumi.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/892032472.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/masawibi.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/99432652129.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/84182646469.pdfIn PDF document text
    • https://novitas.ro/files/6728338512.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/97471170628.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/tarawufozitixofami.pdfIn PDF document text
    • http://farashimirooz.com/files/bipuvadomitixarabupufis.pdfIn PDF document text
    • http://potya.com/pevelikabogesumip.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/pelexakavuviwobeluzela.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/witeminamun.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/lezipe.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/bigexekatofileb.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/nefig.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/fuvamanogasufamisusa.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/56252263071.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/muwozumorij.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/vexinusaxalavesak.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/27848537054.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/rozopadugutuvinozu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA9 10544 bytes
SHA-256: 6a865a8fa25ea377afd885b4058a6d28f05df1e514f6fcd9fedddd7023e78d8b
font_01_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 24196 bytes
SHA-256: 5b1103ebfc5508c511f1ea4e183a435d43555c83a5308ef4193cfe7bbde95297
font_02_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off000137a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A6 1888 bytes
SHA-256: 54d5e680047c0275be239c4ad274ad444bbe9aa94e270cc8adfe718f7e615c10
font_04_sfnt_off0001407a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1