Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78e798f2e361c47…

MALICIOUS

PDF

94.0 KB Created: 2021-09-12 12:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bd8f068a8193a076e4ec884e306ddad3 SHA-1: 46c67b53d3dea2b97185fdfd83e42affd36fdf73 SHA-256: b78e798f2e361c47936473e5287104c11250398de589a5c9952aba16943063f0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness. The document uses urgency lures and a download button to trick users into clicking links. These links lead to a link farm hosted on numerous disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and a link farm on disposable hosting are key indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=madam+chief+minister+watch+online+123movies PDF link annotation
    • http://donghobaoan.com/uploads/files/kesuginutisilelul.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ps0jii7c34871que78q2439sbl/xulemowan.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/77720355582.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/pifabezevixiwumirupul.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/84089016819.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/zobedug.pdfIn PDF document text
    • http://www.ezmoving.com/file/64085986887.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/nuvulevuveredejewaxawa.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/12002099625.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/76018702190.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/61114398057.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/vexidinopavarejoni.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/7163618773.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b681a42db7594e4519e2c688b1d13899/debumox.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/lifunokuwalozugagafa.pdfIn PDF document text
    • http://accronline.com/userfiles/file/mutilab.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/ruxebuwuxodudenuzo.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/sewurudej.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/23524523879.pdfIn PDF document text
    • http://artdental.hu/editor_up/safedisujimira.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca818613aa---faxigafuxi.pdfPDF link annotation
    • https://ispartaorganizasyon.com/ckfinder/upload/files/27251188564.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_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 11232 bytes
SHA-256: dcabdf85705d2bbec7157ac11e773a186f5d0b97acd2eacbf87253848737acc8
font_01_sfnt_off00011c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 20604 bytes
SHA-256: f68202137fc6b2e5c224d0268d9bcc967646d792ff28845ee02b28b7adcf88d1
font_02_sfnt_off00015267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1