Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f73251093560e88…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 12:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a8dadb598d89c0d55324dcb3cea7650 SHA-1: d390061189357c8f597dff4b76c4cf68380a3d3d SHA-256: 3f73251093560e88f193f953274c2c02c4477c47991cbf40d6d568b806cf333b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious sites, potentially for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=plants+vs+zombie+apk+download PDF link annotation
    • https://nedimgame.com/calisma2/files/uploads/20915484232.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/lusobezifukudejixunenuw.pdfIn PDF document text
    • http://portableandcool.com/files/files/warej.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/jizuvaxogorodilove.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/33644098352.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/27413246293.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/woxifi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1fd0fec3c5eaf65c7b4b8cfadaab155/basikosibagidu.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/17755737142.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/dipanufuxo.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/47656208091.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_7B5B592F85AE20CD.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/diwodosamivuben.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/lizulewepekosena.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/fogikapukepozesikofujova.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/35293323332.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/devininakadamogowinekuji.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161379f3ccfc5d---fibigexikixalan.pdfIn PDF document text
    • https://media-get.com/userfiles/files/rokemovedizuvor.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/82271415249.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/69506643207.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/92579620023.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/10986950203.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/89485651712.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/burawima.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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 16652 bytes
SHA-256: 723ee983017d23f4765c3e336d61c6829a7451334300d4eb6061a6e0d05c467c
font_01_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 10896 bytes
SHA-256: 6f7471bc78ae229206b67416f5d62cc51c11cfca364a1f73d4b19d2008cf33d7
font_02_sfnt_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1