Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99da2c0df07caa4…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 04:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b094fd33751c1fddcd8bdd38b791d4e6 SHA-1: abba79a46b13423b7e9761b2bb9220fe7d414bd7 SHA-256: e99da2c0df07caa4f9c4a8419e066709301c382f7990982880e37a4720a26c30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF acts as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. This behavior is consistent with phishing or malware distribution campaigns, where the initial document serves as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://catamma.ru/uplcv?utm_term=how+do+you+get+a+live+wallpaper+on+iphone+se PDF link annotation
    • https://hahapediatric.com/uploads/files/202109221348103141.pdfIn PDF document text
    • https://proia.bg/userfiles/file/11937127206.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/63487974529.pdfIn PDF document text
    • https://manenshop.com/upload/files/42463733724.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/33330145608.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/23947823043.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/45719738088.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/96231344558.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/namobefevimumumibasa.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/72955388938.pdfIn PDF document text
    • http://pedraferro.com/files/files/furajususibejekutakemi.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/93893472340.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161518d8b26296---bupusedideripunudebax.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/sugumusixebenufudutu.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/patewaki.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/dasarunafile.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/dimisetagirifupozis.pdfIn PDF document text
    • https://finliz.lt/i/File/sagixofevibojari.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/81817617400.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/79720608233.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142798d4d092---8493486815.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/66982000547.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_off0000b023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 14692 bytes
SHA-256: 4041a6dc10516182aa8f7cce0cc5d387d70feff33cc1cddb847312d73acfcb2f
font_02_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 11028 bytes
SHA-256: e769802e5fc66828d4271ee728ac50ca8296bda573ef252d7f899832c1cededc