Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e66972f757f6571…

MALICIOUS

PDF

116.7 KB Created: 2021-03-20 23:26:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: cf14cc1a539d76766172d95e20ae88c1 SHA-1: 2dfaebc93fb95bb0cdeaea51592b009d136c095e SHA-256: 6e66972f757f6571c7d2552dd14dfb9a277b5aea3fac752627aedda1c11b174e
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be distributing links to other potentially harmful documents or engaging in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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.
  • 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://vilenefex.ru/wix?keyword=wahl+9867+manual PDF link annotation
    • http://uniques.space/28802634210cbzgj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393893/normal_5ff883a5dee40.pdfIn PDF document text
    • http://cethq.xyz/gaguvojadinapavugudemutuw099x2.pdfIn PDF document text
    • http://robinmani.site/how_to_lose_weight_whole_bodyq79i1.pdfIn PDF document text
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/67cd7fc172e9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5fcb1810ba858.pdfIn PDF document text
    • http://ludivabuka.iblogger.org/8768766513.pdfIn PDF document text
    • https://turexebino.weebly.com/uploads/1/3/4/2/134265835/92a36e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_604cf23e69275.pdfIn PDF document text
    • https://liloxowilobo.weebly.com/uploads/1/3/4/2/134265539/84b14de.pdfIn PDF document text
    • https://midoninojun.weebly.com/uploads/1/3/4/6/134665084/9599673.pdfIn PDF document text
    • http://fashion-deals.xyz/74213723546hsj8a.pdfIn PDF document text
    • http://justamorem.com/42880171364bjsss.pdfIn PDF document text
    • https://dakesepev.weebly.com/uploads/1/3/4/3/134308776/roxulovope.pdfIn PDF document text
    • https://lavozeto.weebly.com/uploads/1/3/0/7/130775819/59cfd227e057.pdfIn PDF document text
    • https://xolovimuwoza.weebly.com/uploads/1/3/4/8/134865524/d98c0bb3.pdfIn PDF document text
    • https://gixujubemavug.weebly.com/uploads/1/3/5/3/135316724/turiwosumexodiki.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/8582188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_6035893ad8d9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_8ff305f4413442fb90903a919f473bcd.pdf?index=trueIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_78a4c53a93de4777bdf0be16829339fe.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_d941b44543dc4bc0890635ef3200eee3.pdf?index=trueIn PDF document text
    • http://fipodumogom.epizy.com/secured_party_creditor_process.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
    • 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_off000159a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A3 5248 bytes
SHA-256: 2967517f95ec6ba667b50f074675c2af0b55821e0e2556a13955795673f1258a
font_01_sfnt_off00016b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B66 17728 bytes
SHA-256: 744025620422156fc868a319aaa84e4ac100c86fc3aa8d77b274e29f6491347a
font_02_sfnt_off00019fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FD4 21548 bytes
SHA-256: e648e3ebfa2b69415c2ee7696e40baf6ea5ffbe3483fd994ad7605cb3e872663