Malicious PDF — malware analysis report

Static analysis result for SHA-256 b873ba1a06f8fc9f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 15:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92bcc727ceed9ff9d77f7275ad8b13c3 SHA-1: 797db3acfaeeacb491ca10a97e4846d29cce8e10 SHA-256: b873ba1a06f8fc9f41bafde3569e66d411907d80a16ac415cb09bd4a31de0d48
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is used to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript points to an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=cheat+8+ball+pool+2020+android PDF link annotation
    • http://k-ookuma.com/js/upload/files/zexulim.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/10758406903.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/jutabidi.pdfIn PDF document text
    • http://upakuika.com/img/file/zopifukuvidewuralimakixa.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/92417442626.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/zowemapifowozisaluwotiv.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/lepumanuzuxukivopa.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/72988739098.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/34042001051.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/wizupabudelusavepeje.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/rusaxudisisigelunukisub.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/kufelologaduvi.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/87737330976.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/nazepamokokomak.pdfIn PDF document text
    • https://digiconelectronics.com/media/mujowobiwixob.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/bivilazuzeb.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/94069809891.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/75314795656.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/bokevolabu.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/sodusaji.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/busizerenufogu.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/javenotavotasoxamugudajez.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/53341388279.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613729c506cd3---37577777304.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/13896617079.pdfIn PDF document text
    • https://photojet.net/userfiles/file/gaweguzabuwodalubixiw.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_off0000d5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 10944 bytes
SHA-256: 4965724fd1fae357b672e1db067a2d3deeac4fa930e7383016d21f4a78bb8dec
font_01_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 16536 bytes
SHA-256: 3c62acd0a03cac75ea87800d900ad58c10acf3bccbc2b5775208d6d5a2d0b8c2