Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f83b187ea9a936…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 00:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a0cbc2b6ad9e1ab387da04568fcd3f5 SHA-1: ac5cef945e2ddfee1ae739e528cbd7525fa7e090 SHA-256: c4f83b187ea9a93674c9e7371e7253a5ca36e29e9536372d9e685be94cc9fd21
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm with numerous external URIs, including one that appears to be a download lure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites or initiate downloads, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=bad+hair+full+movie+free PDF link annotation
    • https://petikdaun.com/contents/files/28238578559.pdfIn PDF document text
    • http://brenderup.ro/mm/file/vejopurawaxuzefalogelorip.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/41029564914.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/44657767524.pdfIn PDF document text
    • http://scro.ru/pic/file/65463470885.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/jovipivilejexitijabaniso.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/72121643273.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/ludijen.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/65607773541.pdfIn PDF document text
    • http://pbpharm.com/upload/files/moxasazedesiwi.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/66960901835.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/66458918657.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/25380248660.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/98299021823.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/fiwipedenumodavurobimug.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/vefarawalukebutomifedom.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/kewagimurilunegonaxopekaf.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/57516937703.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/85294825170.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a898a59f5b500002f04dcd9ab51ea993/zapimazuz.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/jekerolemasadejagomi.pdfIn PDF document text
    • http://juncheng.tw/upload/files/jibomogegaretubewejin.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/66862699106.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/teboxawuniresutati.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5c76b110a1e36c6f79bcfc7e3d4531b9/nupamumuv.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_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 19632 bytes
SHA-256: 15a2139acbab185cf0deb6c24de06afbe7aeab9f33a1a38bbe60b07b304c3338
font_01_sfnt_off00011dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 10468 bytes
SHA-256: 6b873faf47a120686c3e0d91144bc9f834b10172b6fc9eed849a47c73bd09604
font_02_sfnt_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1