Malicious PDF — malware analysis report

Static analysis result for SHA-256 021d5c73e75ac6d6…

MALICIOUS

PDF

97.5 KB Created: 2021-09-17 23:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 83a9788340466fce64eb35a7d3cbe900 SHA-1: 67de73fda5a33523ef0ad7ac746ff9535137d655 SHA-256: 021d5c73e75ac6d6bdce0ae860914d0df63d17cf70328a166fb30a4ec909722a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The PDF structure and embedded content suggest it's part of a phishing or SEO poisoning campaign, likely intended to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://consoles-a-gagner.com/fckeditor/userfiles/file/tunir.pdf In PDF document text
    • http://studioaeditecne.it/userfiles/file/41708673916.pdfIn PDF document text
    • https://angkalaris.com/contents/files/bunivuwemovajepabal.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/88266734960.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/vedijapapuzirokidozo.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/55076428079.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/viwedisipasarigadepu.pdfIn PDF document text
    • http://c-six.it/userfiles/files/69958864064.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/63796560218.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/kadobarivalerapoguxudiv.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/24573084854.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/30245516387.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/772cb9d9347a5167819848670ce67ff7/18830260110.pdfIn PDF document text
    • http://napiarsaigh.com/images/terorureluxeri.pdfIn PDF document text
    • https://viceda.com/userfiles/file/lafimufogovigabumumadujo.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/5433907911.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/20560180886.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/tefofoledi.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/92077937468.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/21251556129.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/golesovadogodekaw.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/xekono.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/56048749890.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614280ae3ad25---12842784473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=index+of+brooklyn+nine+nine+s06PDF 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_off0001160e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160E 18804 bytes
SHA-256: cd82585e726f4d7d8dbd58b600ecc3941a23b0f7bd41439a4dddc160b7e3bfce
font_01_sfnt_off0001475c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475C 10776 bytes
SHA-256: 2af759f1e97b992b0765bd88efddb51877fe235864b48dd8b910ce16ef451316
font_02_sfnt_off00016044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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