Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc5bd62edf3472b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 09:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4a9eca970d15c471a805ebecd41c1a36 SHA-1: 81baa1edc40fd012e7167f307db4021956497f45 SHA-256: dcc5bd62edf3472b6f0a4166060da0912674c36befa5f84a07c06b0c9f5e470b
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://finalstage.biz/js/upload/files/visofuruxemolaj.pdf In PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/56503078230.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/leruvezoveledewujexatix.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/67381517511.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/62190352858.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/60420705776.pdfIn PDF document text
    • https://proia.bg/userfiles/file/sowuwenikanejit.pdfIn PDF document text
    • http://sdes.in/uploads/74112976802.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/6616335928.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/teravasexexeboguverux.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/bizositerodegijorudiv.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/xidikarewesigutil.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5f4362067adf40aaa169501e43edbcc5/torosonejaduto.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/mikanaxite.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/xabojinojonegos.pdfIn PDF document text
    • http://vpsystem.com/files/fck/83251697980.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/tipeviveluwaz.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/59430695211.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/99016898760.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/wofusozizizexusoweruzi.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/fupedawamipewuvej.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/79220998679.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/nunalabav.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/70010079579.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/majiguda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=nintendo+64+smash+bros+romPDF link annotation
    • 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_off0000b2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 17704 bytes
SHA-256: 5df844547290d1ece12235b2945396f4ede7bc88523b217654c5eff7a0e9af3b
font_02_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 10828 bytes
SHA-256: 90aec79921322bffb6f5865e9cfc48d856adc42e3360481d669cdb76c1cb1935