Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45444d014877681…

MALICIOUS

PDF

74.0 KB Created: 2021-09-29 06:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: acb3c712f4d128fa64e67c718fe161ec SHA-1: de701f1c72379d6195d6672b3b5b955bfd417ff3 SHA-256: e45444d0148776816c0e72d8610562b1ac9aa2197e7e37842b6270dbd14ef920
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=stickman+annihilation+2+mod+apk PDF link annotation
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/48223370238.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/goseminagizefibina.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/11104967779.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/5157505759.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noropa.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/zikumome.pdfIn PDF document text
    • https://menu2uplus.com/images/file/3105099787.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/80031667059.pdfIn PDF document text
    • http://thehbbq.com/uploads/files/gozidusevari.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/4631336892.pdfIn PDF document text
    • http://montereypark.kopanramen.com/uploads/files/lofubakefozazuvejomiguse.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kukiwozojagizag.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/daveteloba.pdfIn PDF document text
    • http://hadt.vn/upload/files/1006149928.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/dojowimiruraxutow.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/dcvr154712o31d8klgtalrkbta/74892875412.pdfIn PDF document text
    • http://skia22.ru/pic/file/11635549149.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/2755932111.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/16482106708.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/55116324856.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/97570659449.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/mevaxosakotapakituf.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16147d3a078585---84799422979.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/zijekozoxajewowidoxupikax.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_off0000b5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEB 10668 bytes
SHA-256: ec543255ca41d4150655e1019a47c68b81bb06d00f7faaffa96e1fda97246571
font_02_sfnt_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 19980 bytes
SHA-256: ace5e813e19fa67d43d45862c51435ce1f3dfe161e1e2c3212d44cacdd231f6c