Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2cb64b8caa258d…

MALICIOUS

PDF

47.8 KB Created: 2020-11-09 06:07:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f87f3cb6aa1194382b38104609a1f203 SHA-1: c7bd5c46884a6fd55895eeb9a07119764fc74371 SHA-256: 1e2cb64b8caa258d34f978a7395625e66bfcd72b4ab16767cd9307eead4baa3f
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' lure and a 'password archive' lure further supports a malicious intent to trick users into downloading and potentially decrypting further payloads. The document body itself contains obfuscated text and URLs, reinforcing the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffe.ru/123?keyword=sylacauga+high+school+football+schedule+2019 PDF link annotation
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/punumituziruxopit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_5fa37df0cf7b8.pdfIn PDF document text
    • https://zixotojene.weebly.com/uploads/1/3/4/3/134315054/berulalakowapu-radas.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/zupojez_zipufukenoxowa.pdfIn PDF document text
    • https://duxevuwelinabim.weebly.com/uploads/1/3/4/3/134353564/341c646338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fugekuf.files.wordpress.com/2020/11/togovoxifeginot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda3abee-936a-4f52-99e3-67ef7ca54aba/lipewunomolisuragobira.pdfIn PDF document text
    • https://bivananoso.files.wordpress.com/2020/11/89335943961.pdfIn PDF document text
    • https://wurapeweziwe.files.wordpress.com/2020/11/rifekowirovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a1f96d4-00c9-4e85-bfea-0d5e01e08486/widekariwajamibikozigowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0639b357-5cb6-45a4-b2cf-feae6bccb3f7/99353384234.pdfIn PDF document text
    • https://nodexedi.files.wordpress.com/2020/11/ragarutesetuwejarofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61cb5c5e-9def-4c6b-920c-a2787f8d0e32/98637638698.pdfIn PDF document text
    • https://mewafibita.files.wordpress.com/2020/11/pixisagamedowiselebagupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07861a12-7065-4cc2-ac62-fc300cbd348b/pinebezupawiset.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1B 6016 bytes
SHA-256: 449af3c972a79254dfd7c35c9d04f5bd67922b1edb8753966c403ecbf0e008ac
font_01_sfnt_off00007f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8F 2140 bytes
SHA-256: 49dddaa543544930169c80d10742cf71a10a90771d945bdf421e53748b1fa594
font_02_sfnt_off00008969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8969 12436 bytes
SHA-256: 352fbb7c862c8663f16dcc9ca98717278de3207a549ddf5864899c47b2773122

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