Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22e8436dd06f4c1…

MALICIOUS

PDF

80.3 KB Created: 2021-10-06 14:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a8d8944102f95a46a40af2f00ed85a04 SHA-1: a9941c216817eb0c4682afb3e68e1fe587c1eff2 SHA-256: e22e8436dd06f4c1eb3830d6b2a47b0d7552194e363ab3d9b65f472d718ad895
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable domains, suggesting a tactic to obscure malicious destinations or distribute various payloads. While no scripts were explicitly extracted, the nature of the PDF and the presence of numerous external URIs suggest it is designed to redirect users to malicious sites, likely for phishing or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://outspokenholland.com/userfiles/fckFile/20211001182204.pdf In PDF document text
    • http://csc010.com/userfiles/file/20211004011029_k7pjag.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/25692064737.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/zawepefidazegapedo.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/61238542044.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/zuneradetiwaxokixujurus.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/luretomugibuvupabowovipol.pdfIn PDF document text
    • http://rooptex.com/uploads/lumevosobirawasataw.pdfIn PDF document text
    • http://ping-property.com/user_img/files/30158497115.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/58008027744.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/90933658871.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16152279272d8b---36273271572.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/54438016508.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/f949ppgotcbnqtmqbkcars7987/kokabekaxo.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/nafokaxoxubagitisatata.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/mipititorixu.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/kijezepemidi.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/zixotov.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/32007716348.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/sokebobafujaxepe.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/pinukitoluniwuxevo.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/69934807775.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/59876968767.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/29769534156.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/12651387762.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/binut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pain+in+both+lower+extremities+icd+10PDF 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_off0000d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C0 18640 bytes
SHA-256: 7bb597851beed3573479cad2fc4f90fdda36afd312f35cec54169da26988fef4
font_01_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 11136 bytes
SHA-256: 8388193d952bb8cc98ca64683ce60e2604dc4b44eec11760f739a1b24e064c40
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1