Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34ac8fbc5ead897…

MALICIOUS

PDF

94.0 KB Created: 2021-09-10 18:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff20379c558e1dc8b36cb0ee98c079d2 SHA-1: 00a0c74b07fda4eeeda0ff238c774eca2c7e9692 SHA-256: f34ac8fbc5ead8976ff8adc13544b5927d4d14417887d63ed7354c48d70ee240
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, containing numerous links to external domains, many of which are disposable. One URL, https://bisleri.genefied.co/ckfinder/userfiles/files/35913968787.pdf, is specifically identified as a potential lure. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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://bisleri.genefied.co/ckfinder/userfiles/files/35913968787.pdf In PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/15091519188.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/mesezoluburomo.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/15529441471.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/62370993927.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/jorepobipa.pdfIn PDF document text
    • http://chinahongji.com/d/files/gusulabozev.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/damaxemuvojinijuti.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/43761116293.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/46905185104.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210901113108315.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/2883076800.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/40367577070.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a4e51645---pepulowinuxezukumeleler.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/dazoge.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/85809200847.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/39207007921.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/587hngpgid943o79putr31ee5k/damemabenubove.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/jolifukalage.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/lumujejakif.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/98704230511.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/59176742932.pdfIn PDF document text
    • http://stl-log.com/htdocs/cljr/data/files/fobabobawozuvopisexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+work+of+art+in+the+age+of+mechanical+reproduction+pdfPDF 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_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 11140 bytes
SHA-256: afb8238fddf9593cc516f6e9a6f65e2c9b2b98c783220cfb7b164671827cc2dd
font_01_sfnt_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001383d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383D 19304 bytes
SHA-256: e4adde05414b5728de183c452ba7feb0902b02cf18e26540c87439fad81e832c