Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3615fe5067f2847…

MALICIOUS

PDF

89.4 KB Created: 2021-04-07 22:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 142351892e9a28f2dd9729cf2c185203 SHA-1: c4be58a8ccc8d7bfdfcc34490a7696ca937561ed SHA-256: f3615fe5067f2847b59747f8d911a66ca0715695b5973ca965f3dc4f2c89e105
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://kuzutuzo.ru/wix?keyword=are+popee+and+kedamono+dating PDF link annotation
    • https://xopekasas.weebly.com/uploads/1/3/4/7/134748476/jurujasegapoper.pdfIn PDF document text
    • http://visezuxopusifik.iblogger.org/18364902224.pdfIn PDF document text
    • https://xetolakovi.weebly.com/uploads/1/3/4/6/134604046/7339528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374369/normal_6000ae87de9fe.pdfIn PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/5680440.pdfIn PDF document text
    • https://cdn.sqhk.co/pugusomimoro/LjcNJhj/atomy_singapore_member_form.pdfIn PDF document text
    • https://bovidekomuburo.weebly.com/uploads/1/3/5/3/135312485/sisikevogaxukej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370778/normal_6008ffa1e6101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_6031ad182c89c.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/c3s9hjW/61237125012.pdfIn PDF document text
    • https://tarebizadutobi.weebly.com/uploads/1/3/4/3/134310067/diwenenoma-vojowesovaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_f3b7a69e7f354297bfcaabdb943e5cb6.pdf?index=trueIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_084f15d8ec9c49e985a5482f8a3e0626.pdf?index=trueIn PDF document text
    • http://dawozisi.rf.gd/camtasia_studio_8_for_mac_free.pdfIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_c3032bede50446c5a2b7d036ae538788.pdf?index=trueIn PDF document text
    • http://jejemizon.rf.gd/81428050025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2083e438-c40b-42b1-bb0a-8311aa35823b/principles_of_interpretation_of_lists.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134fecdb-5e62-4c10-b432-7d3cd394f656/rebasalokur.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 5120 bytes
SHA-256: 87c29707acbbb426e557f79adaa4a01b630b0b6f67396f2e78822d7358c65f34
font_01_sfnt_off00013255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13255 11244 bytes
SHA-256: 54d00b8aaa1b7503aecbfd29847defa717807d126fba0f1d94b32f3f42602b6a