Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9b381b15a35468…

MALICIOUS

PDF

75.3 KB Created: 2021-09-26 02:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d6f7738f37c1be9e7f693a7b2acf45d2 SHA-1: dc969c7d98767573cba8d0074673bb655f526cab SHA-256: eb9b381b15a3546827a4fc7fcc3b72f3a9a1ad59b3c96c139c911a1417f12f55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is structured as a link farm, with many links pointing to disposable hosting. One notable URL is https://allytemp.ru/uplcv?utm_term=android+recovery+mode+starten, which likely serves as a lure for phishing or malware delivery. No scripts were extracted, but the PDF structure itself suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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+recovery+mode+starten PDF link annotation
    • http://barcelonasixtytwo.com/userfiles/file/valanufav.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/zorewafosebaw.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/8364992700.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/66610633122.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/mobujesuvelovomax.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/zopiwaxakobosisexunabis.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/47485019497.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/dezujatisubeberudatewar.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/netilusolemupopiwumisufol.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/43169150564.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/55727444873.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109161336491705.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/40057029093.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/peliniwijesemos.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/pavupilete.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210920_200019.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613025a027355---jesaxe.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/71704537167.pdfIn PDF document text
    • http://usateatop.com/_upload/files/bolibejibejizisosudovu.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/labimarawomosad.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/53741978971.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/bubapozovorebofalazid.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/92765106227.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_off0000bbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAA 10648 bytes
SHA-256: 4a6d9a7ccf9e51455c6fd9307d29ba37ba51b1823af33239289c7ec4e5411096
font_01_sfnt_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 19584 bytes
SHA-256: b008e147cdba63b275c838cf43341e1921b5aeca4ed48576f60f97feadddbd88