Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe31ac8148a4c893…

MALICIOUS

PDF

79.5 KB Created: 2021-05-30 21:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b9ac275ed5687459a145708aa7d7156 SHA-1: 0eb040de44bb261a33472f9349397d4f91288890 SHA-256: fe31ac8148a4c8936a966dbc41b9ad344519726bdbc338902c8cab824ae3a6dd
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, and the 'SE_INVOICE_LURE' suggests a deceptive pretext. While no scripts were directly extracted, the presence of numerous external URLs implies an attempt to redirect the user to malicious content or exploit kits, likely leveraging PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://resalured.ru/123?utm_term=life+cycle+cost+analysis+spreadsheet+template
    • https://cdn-cms.f-static.net/uploads/4472776/normal_5fe902ba00b3c.pdf
    • https://cdn-cms.f-static.net/uploads/4423189/normal_5fd8d947873ba.pdf
    • https://cdn-cms.f-static.net/uploads/4460266/normal_6025e0206ad47.pdf
    • https://jajufuwupu.weebly.com/uploads/1/3/1/1/131163717/kofuluxokubowij.pdf
    • https://mowibusox.weebly.com/uploads/1/3/4/5/134591082/jedilepif_likunenevuzima_budezazow.pdf
    • https://cdn-cms.f-static.net/uploads/4425507/normal_6044225246c98.pdf
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5fdb0d906f5bb.pdf
    • https://musagitunoton.weebly.com/uploads/1/3/4/3/134368320/715198.pdf
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/puxixaweda-gamajo.pdf
    • https://bomovote.weebly.com/uploads/1/3/5/3/135398027/782d8f4.pdf
    • https://cdn-cms.f-static.net/uploads/4478398/normal_606555289804e.pdf
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/xupaxizevad.pdf
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/3427619.pdf
    • https://fokagiwixus.weebly.com/uploads/1/3/4/6/134652182/5372485.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/00297834-ee46-45e3-9e05-5c35a3b1c4ab/hp_laserjet_4050n_driver_download_windows_7.pdf
    • https://uploads.strikinglycdn.com/files/429af684-3e39-41be-924c-88ec0ac5df49/backyard_discovery_beach_front_swing_set_instructions.pdf
    • https://uploads.strikinglycdn.com/files/e0ad41d4-ab93-4acb-876e-621e5b0e5a41/niresivobubiwanebejojixij.pdf
    • https://uploads.strikinglycdn.com/files/e803b117-e422-429f-ab51-7aec5e877166/mazafe.pdf
    • https://uploads.strikinglycdn.com/files/b578819a-a36a-45a1-a2c3-ee2792ff5cdd/lituna.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9e.bin
5d26d0a83c01008c1a6f92d76e7edfa00808c618948e44d542ac6d853853194d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 5224 bytes
font_01_sfnt_off0000fd30.bin
1f539afe5f79bc486f5518200837d9957f83d9aa0d929aecf3e7c7dde0abf73f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 10932 bytes
font_02_sfnt_off000122a9.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 4324 bytes