Malicious PDF — malware analysis report

Static analysis result for SHA-256 802e302fd46d3b86…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 07:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8604ed804f6c5eef1435a70a6837cf9 SHA-1: 3053f5eede902acd711e9844c7da82f0b1bcc68c SHA-256: 802e302fd46d3b86e8aa7927c22c1e8368f1ffc2e81b748fe9de1f0d1cd8701f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains a high number of embedded links, many pointing to domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures, but the sheer volume of links and the heuristic firings are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jairdefreitas.com/ckfinder/userfiles/files/mivosoduzuwofovubapu.pdf In PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/kewewukuzelepos.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/mizosizuvawozusuwa.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/kafenubemowotobanozanu.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/30283992621.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/90541327364.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/98091681119.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/93147279212.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/9361559115.pdfIn PDF document text
    • https://wasael.com/userfiles/file/90890468783.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/sopukowoponolomatajiwube.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/bawuxi.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/gadafopogerogexadigadolov.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/20456402666.pdfIn PDF document text
    • http://ropesadventure.com/d/files/84406448521.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/salopubiw.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/nepawofobepej.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/mtpot2j8dgpgtiht7c1490cg2e/ferebeluzag.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/miworafalevopa.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/rojiwifosisadivopunomepug.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/bexixesuletexanejivuxi.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/40631379725.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/82470379743.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/jilidoduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mp4+tubidy+musicPDF 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_off0000cb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 22112 bytes
SHA-256: de2bde696fe89caa3dbf475601dd72cf138259dbc3b25d8d92e4920f79a1ea51
font_02_sfnt_off00011e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E52 10436 bytes
SHA-256: 7c399fb35f50bfd68ae36a26f5f00bf5c4c8f9dd493672c5093556cdc142feca