Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec7d582d65edca1…

MALICIOUS

PDF

50.3 KB Created: 2020-11-05 17:58:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f840310bd833b561b27a3e1fab752d98 SHA-1: 68dd89d77d3d81028c08f7b0371ba30ea334bef5 SHA-256: 7ec7d582d65edca154e4e0c6bb869381b02bf74314d7b02c527741aae4be3f59
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://cctraff.ru/123?keyword=brute+lawn+mower+oil In PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/6632099.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/lavosapi.pdfIn PDF document text
    • https://gulemexaw.weebly.com/uploads/1/3/4/3/134360266/zesojamu.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/5176519.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/wogabavif.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/1f3164e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0006f4d4-c44a-4ad9-b69d-7351ecf390a3/kijojalajidagifajiwexidim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7fe3a0d-831c-4fba-b502-0eefced30de6/essential_instant_pot_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb1934f-dbdb-49c5-ada8-6a1021fde05c/89553223564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebe131a-ce5b-4ae4-bbec-19dcfed1252c/70916427576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e59aaf-49e7-4939-9fd1-72a510d1b0d3/3660293655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186fd83f-8d56-4656-9b4c-87c2ebaf3ef2/dizalatosi.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/rilopodadubawijifazawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f7c804-6cc5-45ee-bc54-b5d5d2c661c1/sejosanujagefaxomamix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25274055-5437-4c09-8c9e-695945298ee6/55786003184.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_off00007977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7977 4676 bytes
SHA-256: 16630efcef038dd9d5b32b247ce1372ab14c00501a8a25c153cf187cd890cc83
font_01_sfnt_off0000894c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x894C 11132 bytes
SHA-256: ce4bebf351e902aba12bc1457e1ba847ed9fcab0b5f3e42e370dcc328df66759
font_02_sfnt_off0000ae26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE26 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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